tests: Don't check example blueprints if we don't have to

ATM osbuild-composer doesn't ship example blueprints

tests/cli/test_blueprints_sanity.sh

@@ -11,10 +11,12 @@ CLI="${CLI:-./src/bin/composer-cli}"
 
 rlJournalStart
     rlPhaseStartTest "blueprints list"
+        if [ "$BACKEND" != "osbuild-composer" ]; then
             for bp in example-http-server example-development example-atlas; do
                 rlAssertEquals "blueprint list finds $bp" \
                     "`$CLI blueprints list | grep $bp`" "$bp"
             done
+        fi
     rlPhaseEnd
 
     rlPhaseStartTest "blueprints save"