[EDFTomoScan] fix: check if path is None before updating

tomoscan/esrf/edfscan.py

@@ -235,9 +235,10 @@ class EDFTomoScan(TomoScanBase):
 
     @docstring(TomoScanBase.update)
     def update(self):
-        self.projections = EDFTomoScan.get_proj_urls(self.path, n_frames=self._edf_n_frames)
-        self._darks = EDFTomoScan.get_darks_url(self.path)
-        self._flats = EDFTomoScan.get_refs_url(self.path)
+        if self.path is not None:
+            self.projections = EDFTomoScan.get_proj_urls(self.path, n_frames=self._edf_n_frames)
+            self._darks = EDFTomoScan.get_darks_url(self.path)
+            self._flats = EDFTomoScan.get_refs_url(self.path)
 
     @docstring(TomoScanBase.load_from_dict)
     def load_from_dict(self, desc: Union[dict, io.TextIOWrapper]):