fix(stack-upgrade): stack-upgrade will work correctly when no previous containers were running

scripts/rcstack/rcstack

@@ -3490,12 +3490,18 b' rcstack_stack_upgrade_rhodecode_command() {'
     scale_2=$(( scale * 2 ))
 
     echo ""
-    echo "Found $scale services for $target_container"
-    echo "existing docker-ids:" "${old_docker_ids[@]}"
+    echo "Found $scale old container[s] for $target_container"
+    echo "Old container-ids:" "${old_docker_ids[@]}"
     echo ""
 
-    echo "Scaling to 2x ($scale_2 total) containers for $target_container"
-    ./$RC_SCRIPT_NAME stack rhodecode up $target_container --no-recreate --detach --scale $target_container=$scale_2
+    if [[ $scale == "0" ]]; then
+      echo "No previous services found, doing a regular start for $target_container"
+      ./$RC_SCRIPT_NAME stack rhodecode up $target_container --detach
+      return
+    else
+      echo "Scaling to 2x ($scale_2 total) containers for $target_container"
+      ./$RC_SCRIPT_NAME stack rhodecode up $target_container --no-recreate --detach --scale $target_container=$scale_2
+    fi
 
     # array with ALL new containers
     local -a scaled_docker_ids