Release lock at end of ROM test

src/openflexure_microscope_server/things/stage_measure.py

@@ -152,6 +152,7 @@ class RangeofMotionThing(lt.Thing):
         if not got_lock:
             raise RuntimeError("Trying to run ROM test when a test is already running.")
 
+        try:
             rom_deps = RomDeps(
                 autofocus=autofocus, stage=stage, csm=csm, cam=cam, logger=logger
             )
@@ -176,7 +177,9 @@ class RangeofMotionThing(lt.Thing):
                 for axis_dir in directions:
                     # Create a new tracker at start of measurement.
                     self._rom_data = RomDataTracker()
-                self._move_until_edge(axis=axis, direction=axis_dir, rom_deps=rom_deps)
+                    self._move_until_edge(
+                        axis=axis, direction=axis_dir, rom_deps=rom_deps
+                    )
                     # Append final position from tracker
                     axis_limits.append(self._rom_data.final_position[axis])
                 # Calculate step range.
@@ -185,7 +188,8 @@ class RangeofMotionThing(lt.Thing):
             total_time = time.time() - start_time
             logger.info(f"Range of motion is {step_range[0]} x {step_range[1]} steps")
             self.calibrated_range = step_range
-
+        finally:
+            self._lock.release()
         return {
             "Time": total_time,
             "CSM Matrix": csm.image_to_stage_displacement_matrix,