make multipart robust against ill-formed body, prevents SIGSEGV

[hsiegmund]

No description provided.

[crow-clang-format]

--- include/crow/multipart.h	(before formatting)
+++ include/crow/multipart.h	(after formatting)
@@ -173,7 +173,8 @@
                 while (body != (crlf))
                 {
                     size_t found = body.find(delimiter);
-                    if (found == std::string::npos) {
+                    if (found == std::string::npos)
+                    {
                         // did not find delimiter; probably an ill-formed body; ignore the rest
                         break;
                     }

[The-EDev]

There's probably more to be done here, maybe signaling that this is an ill formed body. But this is a good start for the time being. Thank you for your help!