Skip Flatpak updates if Flatpak is not installed.

And remove the too broad ignore_errors.

update.yaml

@@ -29,17 +29,22 @@
           register: fwupdmgr
           changed_when: fwupdmgr.stdout_lines|length > 0
 
+        - name: Gather package facts
+          package_facts:
+
+        - name: Update Flatpaks
+          when: |-
+            'flatpak' in ansible_facts.packages
+          block:
             - name: Update Flatpaks appstream
               command:
                 cmd: flatpak update --appstream
-          ignore_errors: true
               changed_when: false
 
             - name: Update Flatpaks
               command:
                 cmd: flatpak update --assumeyes
               register: flatpak_update
-          ignore_errors: true
               changed_when: |-
                 "Nothing to do" not in flatpak_update.stdout
 
@@ -47,7 +52,6 @@
               command:
                 cmd: flatpak uninstall --unused --assumeyes
               register: flatpak_unused
-          ignore_errors: true
               changed_when: |-
                 "Nothing" not in flatpak_unused.stdout