PdoMap.save(): reverted "if self.map is not None" check

Author: bizfsc

canopen/pdo/base.py

@@ -395,7 +395,7 @@ def save(self) -> None:
             logger.info("Setting SYNC start value to %d", self.sync_start_value)
             self.com_record[6].raw = self.sync_start_value
 
-        if self.map:
+        if self.map is not None:
             try:
                 self.map_array[0].raw = 0
             except SdoAbortedError: