Fix bug when a 2D detector is present but images are empty

lib/backend/gixd.py

@@ -317,9 +317,15 @@ def process_gixd_scan(
     fig = None
 
     # Avoid crash of the cell if 2D detector is not present
+    # or if the images are empty
     if x is None:
         is_plot = False
         is_save = False
+    else:
+        if np.shape(mat_binned)[1] == 0:
+            is_plot = False
+            is_save = False
+            print(_RED+'\t. Images of 2D detector are empty'+_RESET)
 
     if is_plot:
         fig = plot_gixd_scan(