[BUG]

- Fixed bug when surface is 0 for the assert of multiple faults in a series

[test]

- fixing travis: emg3d

Author: Leguark

gempy/core/model.py

@@ -321,13 +321,13 @@ def set_is_fault(self, series_fault: Union[str, list] = None, toggle: bool = Fal
 
         """
         series_fault = np.atleast_1d(series_fault)
-        if twofins == False:
+        if twofins is False:
             for fault in series_fault:
-                if len(self.surfaces.df[self.surfaces.df.series == fault]) != 1:
-                    raise AssertionError('Having more than one fault in a series is generally rather bad. Better go back '
-                                         'to the function map_series_to_surfaces and give each fault its own series. '
-                                         'If you are really sure what you are doing, you can set twofins to True to '
-                                         'suppress this error.')
+                assert np.sum(self.surfaces.df['series'] == fault) < 2,\
+                    'Having more than one fault in a series is generally rather bad. Better go' \
+                    ' back to the function map_series_to_surfaces and give each fault its own' \
+                    ' series. If you are really sure what you are doing, you can set twofins to' \
+                    ' True to suppress this error.'
 
         self.faults.set_is_fault(series_fault, toggle=toggle)
 

notebooks/integrations/GemPy-discretize-emg3d.ipynb

@@ -3991,7 +3991,11 @@
   {
    "cell_type": "code",
    "execution_count": 20,
-   "metadata": {},
+   "metadata": {
+    "tags": [
+     "nbval-skip"
+    ]
+   },
    "outputs": [
     {
      "data": {