warning added

lig2017 · May 8, 2017 · ef465dc · ef465dc
1 parent b6d1c0f
commit ef465dc
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/pyfluo/data.py b/pyfluo/data.py
@@ -573,6 +573,10 @@ def get_camera_trace(self, camera_idx, data_file=None, verbose=True):
                 trace = Series(trace, Ts=Ts)
 
             else:
+                if data_file is None:
+                    warnings.warn('No traces stored and no data file supplied.')
+                    return None
+
                 roi = self.get_camera_roi(camera_idx)
                 if roi is None:
                     warnings.warn('Could not generate trace because no ROI is stored.')