rework exception handling semantics

The choice is now whether to print a warning.
Previously this was about re-raising the exception.
This is done for stability's sake.

Author: vladak

adafruit_logging.py

@@ -140,7 +140,10 @@ def _level_for(value: int) -> str:
 - ``args`` - The additional positional arguments provided
 """
 
-raiseExceptions = False
+printHandlerExceptions = True
+"""
+Whether to print exceptions caught during handler's emit().
+"""
 
 
 def _logRecordFactory(name, level, msg, args):
@@ -343,11 +346,9 @@ def handle(self, record: LogRecord) -> None:
                     try:
                         handler.emit(record)
                     except Exception as e:  # pylint: disable=broad-except
-                        if raiseExceptions:
-                            raise e
-                        if sys.stderr:
-                            sys.stderr.write(f"Handler {handler} produced exception: "
-                                             f"{repr(e)}\n")
+                        if sys.stderr and printHandlerExceptions:
+                            sys.stderr.write(f"Handler {repr(handler)} produced exception: "
+                                             f"{str(e)}\n")
 
     def log(self, level: int, msg: str, *args) -> None:
         """Log a message.