Prices: improve exceptions & logging

Tidy messages sent to logging.INFO
Use logging's 'extra' argument to make YF log formatting programmatic.
Reclassify some YF price-repair log messages, so that repairs (or repair fails) are level INFO.

Author: ValueRaider

yfinance/exceptions.py

@@ -7,12 +7,6 @@ class YFDataException(YFException):
     pass
 
 
-class YFChartError(YFException):
-    def __init__(self, ticker, description):
-        self.ticker = ticker
-        super().__init__(f"{self.ticker}: {description}")
-
-
 class YFNotImplementedError(NotImplementedError):
     def __init__(self, method_name):
         super().__init__(f"Have not implemented fetching '{method_name}' from Yahoo API")
@@ -27,19 +21,22 @@ def __init__(self, ticker, rationale):
 
 class YFTzMissingError(YFTickerMissingError):
     def __init__(self, ticker):
-        super().__init__(ticker, "No timezone found")
+        super().__init__(ticker, "no timezone found")
 
 
 class YFPricesMissingError(YFTickerMissingError):
     def __init__(self, ticker, debug_info):
         self.debug_info = debug_info
-        super().__init__(ticker, f"No price data found {debug_info}")
+        if debug_info != '':
+            super().__init__(ticker, f"no price data found {debug_info}")
+        else:
+            super().__init__(ticker, "no price data found")
 
 
 class YFEarningsDateMissing(YFTickerMissingError):
     # note that this does not get raised. Added in case of raising it in the future
     def __init__(self, ticker):
-        super().__init__(ticker, "No earnings dates found")
+        super().__init__(ticker, "no earnings dates found")
 
 
 class YFInvalidPeriodError(YFException):