Fix loggers code

Author: szymonlipinski

magicbus/plugins/loggers.py

@@ -30,8 +30,10 @@ def log(self, msg, level):
                 if isinstance(complete_msg, unicodestr):
                     complete_msg = complete_msg.encode(self.encoding)
             else:
-                if not isinstance(complete_msg, unicodestr):
-                    complete_msg = complete_msg.decode("utf-8")
+                if isinstance(complete_msg, unicodestr):
+                    encoding = self.encoding or "utf-8"
+                    complete_msg = complete_msg.encode(encoding, errors="backslashreplace")
+
             self.stream.write(complete_msg)
             self.stream.flush()