More tests and assoicated bugfixes

src/openflexure_microscope_server/things/camera/__init__.py

@@ -596,6 +596,7 @@ class BaseCamera(lt.Thing):
         """Validate and set background_detector_name."""
         if name not in self._all_background_detectors:
             self.logger.warning(f"{name} is not a valid background detector name.")
+            return
         self._background_detector_name = name
 
     @property

src/openflexure_microscope_server/things/smart_scan.py

@@ -187,7 +187,8 @@ class SmartScanThing(lt.Thing):
     def _set_workflow_name(self, name: str) -> None:
         """Validate and set workflow_name."""
         if name not in self._all_workflows:
-            self.logger.warning(f"{name} is not a valid scan workflow name.")
+            self.logger.warning(f"'{name}' is not a valid scan workflow name.")
+            return
         self._workflow_name = name
 
     @property