[AI Assistance] Don't hide changes

When the Patch Widget rerenders the changes may be empty.
We should respect the current status.

Bug: none
Change-Id: I229d9c54f21415511b336a03d88d68efb9a35706
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6416093
Reviewed-by: Ergün Erdoğmuş <[email protected]>
Commit-Queue: Ergün Erdoğmuş <[email protected]>
Auto-Submit: Nikolay Vitkov <[email protected]>

Author: Lightning00Blade

front_end/panels/ai_assistance/PatchWidget.ts

@@ -207,7 +207,7 @@ export class PatchWidget extends UI.Widget.Widget {
       }
 
       function renderContent(): LitTemplate {
-        if (!input.changeSummary || input.savedToDisk) {
+        if ((!input.changeSummary || input.savedToDisk)  && input.patchSuggestionState === PatchSuggestionState.INITIAL) {
           return nothing;
         }
 
@@ -218,7 +218,7 @@ export class PatchWidget extends UI.Widget.Widget {
         }
 
         return html`<devtools-code-block
-          .code=${input.changeSummary}
+          .code=${input.changeSummary ?? ''}
           .codeLang=${'css'}
           .displayNotice=${true}
         ></devtools-code-block>