Convert to ES6 Class Refactoring fails with empty catch clause

[hbenl]

TypeScript Version: nightly (2.6.0-dev.20170916)

Try the refactoring on the following code:
Code

function MyClass() {
}
MyClass.prototype.foo = function() {
    try { doStuff(); } catch(e) {}
}

Expected behavior:
The code is refactored

Actual behavior:
Typescript throws an Error:

[Error  - 11:06:40] 'getEditsForRefactor' request failed with error.
Error processing request. Debug Failure. False expression.
Error: Debug Failure. False expression.
    at getPos (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:72918:22)
    at assignPositionsToNodeArray (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73354:29)
    at Object.visitEachChild (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:43020:45)
    at assignPositionsToNode (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73342:30)
    at visitNode (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:42792:23)
    at Object.visitEachChild (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:43052:43)
    at assignPositionsToNode (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73342:30)
    at Object.visitNodes (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:42829:48)
    at assignPositionsToNodeArray (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73349:30)
    at Object.visitEachChild (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:43020:45)
    at assignPositionsToNode (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73342:30)
    at visitNode (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:42792:23)
    at visitFunctionBody (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:42875:23)
    at Object.visitEachChild (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:42914:510)
    at assignPositionsToNode (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73342:30)
    at Object.visitNodes (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:42829:48)
    at assignPositionsToNodeArray (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73349:30)
    at Object.visitEachChild (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:43060:355)
    at assignPositionsToNode (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73342:30)
    at getNonformattedText (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73318:52)
    at ChangeTracker.getFormattedTextOfNode (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73285:40)
    at ChangeTracker.computeNewText (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73279:33)
    at c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73254:44
    at Map.forEach (native)
    at ChangeTracker.getChanges (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73247:32)
    at Object.getEditsForAction (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:75033:42)
    at Object.getEditsForRefactor (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:73512:41)
    at Object.getEditsForRefactor (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:77543:32)
    at IOSession.Session.getEditsForRefactor (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:83445:59)
    at Session.handlers.ts.createMapFromTemplate._a.(anonymous function) (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:82407:61)
    at c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:83622:88
    at IOSession.Session.executeWithRequestId (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:83613:28)
    at IOSession.Session.executeCommand (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:83622:33)
    at IOSession.Session.onMessage (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:83642:35)
    at Interface.<anonymous> (c:\GitTF\Aktuell\WebDispo\node_modules\typescript\lib\tsserver.js:84789:27)
    at emitOne (events.js:96:13)
    at Interface.emit (events.js:191:7)
    at Interface._onLine (readline.js:241:10)
    at Interface._normalWrite (readline.js:384:12)
    at Socket.ondata (readline.js:101:10)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:191:7)
    at readableAddChunk (_stream_readable.js:178:18)
    at Socket.Readable.push (_stream_readable.js:136:10)
    at Pipe.onread (net.js:560:20)

@Andy-MS this sounds very similar to #18437 which you fixed last week.