FIX: that null check works for array elements

src/caosadvancedtools/table_importer.py

@@ -388,7 +388,8 @@ class TableImporter():
                 if key not in df.columns:
                     continue
 
-                if pd.isnull(row.loc[key]):
+                null_check = pd.isnull(row.loc[key])
+                if (isinstance(null_check, np.ndarray) and null_check.any()) or (not isinstance(null_check, np.ndarray) and null_check):
                     errmsg = (
                         "Required information is missing ({}) in {}. row"
                         " (without header) of "