Fix/409 bug error handling in investparameterslinked periods (#415)

* Add early check for non existant periods with linked periods as a tuple used

* Add extra except phrase to version handling in init

Author: FBumann

flixopt/__init__.py

@@ -7,7 +7,7 @@
 
 try:
     __version__ = version('flixopt')
-except PackageNotFoundError:
+except (PackageNotFoundError, TypeError):
     # Package is not installed (development mode without editable install)
     __version__ = '0.0.0.dev0'
 

flixopt/interface.py

@@ -963,6 +963,11 @@ def transform_data(self, flow_system: FlowSystem, name_prefix: str = '') -> None
                 raise TypeError(
                     f'If you provide a tuple to "linked_periods", it needs to be len=2. Got {len(self.linked_periods)=}'
                 )
+            if flow_system.periods is None:
+                raise ValueError(
+                    f'Cannot use linked_periods={self.linked_periods} when FlowSystem has no periods defined. '
+                    f'Please define periods in FlowSystem or use linked_periods=None.'
+                )
             logger.debug(f'Computing linked_periods from {self.linked_periods}')
             start, end = self.linked_periods
             if start not in flow_system.periods.values: