update exception handling

Author: stephenhky

simcomplex/abssimcomplex.py

@@ -46,11 +46,11 @@ def betti_number(self, i):
         else:
             try:
                 boundop_i_rank = np.linalg.matrix_rank(boundop_i.toarray())
-            except np.linalg.LinAlgError:
+            except (np.linalg.LinAlgError, ValueError):
                 boundop_i_rank = boundop_i.shape[1]
         try:
             boundop_ip1_rank = np.linalg.matrix_rank(boundop_ip1.toarray())
-        except np.linalg.LinAlgError:
+        except (np.linalg.LinAlgError, ValueError):
             boundop_ip1_rank = boundop_ip1.shape[1]
 
         return ((boundop_i.shape[1]-boundop_i_rank)-boundop_ip1_rank)