Allow connection of more than 1 signal conditioner to a signal source

Signed-off-by: Vladislav P <vladisslav2011@gmail.com>

src/core/receiver/gnss_flowgraph.cc

@@ -966,7 +966,7 @@ int GNSSFlowgraph::connect_signal_sources_to_signal_conditioners()
                                         }
                                     else
                                         {
-                                            if (j == 0)
+                                            if (j == 0 || !src->get_right_block(j))
                                                 {
                                                     // RF_channel 0 backward compatibility with single channel sources
                                                     LOG(INFO) << "connecting sig_source_ " << i << " stream " << 0 << " to conditioner " << signal_conditioner_ID;