Fix upgrade with no label_selector_include (#6778) (#703)

When `label_selector_include` is not set in Kiali CR, upgrade
still tries to patch some namespaces as variable used to retrieve it has
empty string as value.
Make sure it's not the case anymore.

Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>

roles/default/kiali-deploy/tasks/main.yml

@@ -788,6 +788,7 @@
   - current_cluster_wide_access is defined
   - current_cluster_wide_access|bool == False
   - current_label_selector_include is defined
+  - current_label_selector_include != ""
   - kiali_vars.api.namespaces.label_selector_include is defined
   - current_label_selector_include != kiali_vars.api.namespaces.label_selector_include
 
@@ -884,6 +885,7 @@
   when:
   - no_longer_accessible_namespaces is defined
   - current_label_selector_include is defined
+  - current_label_selector_include != ""
 
 - name: Create additional Kiali label on all accessible namespaces
   vars: