Fix some formatting errors, add test for strategy version

freqtrade/rpc/telegram.py

@@ -1305,10 +1305,11 @@ class Telegram(RPCHandler):
         :return: None
         """
         strategy_version = self._rpc._freqtrade.strategy.version()
-        if strategy_version is None:
-            self._send_msg('*Version:* `{}`'.format(__version__))
-        else:
-            self._send_msg('*Freqtrade version:* `{}`, *Strategy version:* `{}`'.format(__version__, strategy_version))
+        version_string = f'*Version:* `{__version__}`'
+        if strategy_version is not None:
+            version_string += f', *Strategy version: * `{strategy_version}`'
+
+        self._send_msg(version_string)
 
     @authorized_only
     def _show_config(self, update: Update, context: CallbackContext) -> None:

freqtrade/strategy/interface.py

@@ -393,7 +393,7 @@ class IStrategy(ABC, HyperStrategyMixin):
                             ]
         """
         return []
-                    
+
     def version(self) -> str:
         """
         Returns version of the strategy.

freqtrade/worker.py

@@ -115,14 +115,14 @@ class Worker:
             if (now - self._heartbeat_msg) > self._heartbeat_interval:
                 version = __version__
                 strategy_version = self.freqtrade.strategy.version()
-                if (strategy_version != None):
-                    version += ', strategy_version: ' + strategy_version 
+                if (strategy_version is not None):
+                    version += ', strategy_version: ' + strategy_version
                 logger.info(f"Bot heartbeat. PID={getpid()}, "
                             f"version='{version}', state='{state.name}'")
                 self._heartbeat_msg = now
 
         return state
-    
+
     def _throttle(self, func: Callable[..., Any], throttle_secs: float, *args, **kwargs) -> Any:
         """
         Throttles the given callable that it