code: def has_connection(self, i, j):
          
          
          if ( (self._ccore_network_pointer is not None) and (self._osc_conn is None) ):
              self._osc_conn = wrapper.sync_connectivity_matrix(self._ccore_network_pointer);
          
          return super().has_connection(i, j);
docs: !
          @brief Returns True if there is connection between i and j oscillators and False - if connection doesn't exist.
          
          @param[in] i (uint): index of an oscillator in the network.
          @param[in] j (uint): index of an oscillator in the network.