scheduler: Don't drop FileObject when dependencies are not met

Citing @jstucke

> we should probably call
> self._check_further_process_or_complete(file_object) here because it
> might still be possible to do other analyses (instead of just
> dropping the FO). What is more, the analysis progress is not
> calculated correctly if the FO vanishes from scheduling and the FW
> will hang indefinitely in "current analyses"

src/scheduler/analysis/scheduler.py

@@ -362,6 +362,7 @@ def _start_or_skip_analysis(self, analysis_to_do: str, file_object: FileObject):
 
                 if _dependencies_are_unfulfilled(plugin, file_object):
                     logging.error(f'{file_object.uid}: dependencies of plugin {plugin.metadata.name} not fulfilled')
+                    self._check_further_process_or_complete(file_object)
                     return
 
                 runner.queue_analysis(file_object)