Allow empty lines for ConnectivityMatrix

src/mesh/ConnectivityMatrix.hpp

@@ -65,7 +65,7 @@ class ConnectivityMatrix
     Assert(m_row_map[0] == 0, "row map should start with 0");
 #ifndef NDEBUG
     for (size_t i = 1; i < m_row_map.size(); ++i) {
-      Assert(m_row_map[i] > m_row_map[i - 1], "row map values must be strictly increasing");
+      Assert(m_row_map[i] >= m_row_map[i - 1], "row map values must be increasing");
     }
 #endif   // NDEBUG
   }