fix(amazonq): skip edit suggestion if applyDiff fail (#7693)

## Problem

applyDiff may fail and the consequence is the `newCode` to update become
empty string, thus deleting all users' code.


## Before


https://github.com/user-attachments/assets/6524bae2-1374-452d-bb4e-3ec6f865c258






## After




https://github.com/user-attachments/assets/75d5ed7a-6940-4432-a8d9-73c485afb2c3



## Solution


---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: Will-ShaoHua

packages/amazonq/src/app/inline/EditRendering/imageRenderer.ts

@@ -29,6 +29,12 @@ export async function showEdits(
         const { svgImage, startLine, newCode, origionalCodeHighlightRange } =
             await svgGenerationService.generateDiffSvg(currentFile, item.insertText as string)
 
+        // TODO: To investigate why it fails and patch [generateDiffSvg]
+        if (newCode.length === 0) {
+            getLogger('nextEditPrediction').warn('not able to apply provided edit suggestion, skip rendering')
+            return
+        }
+
         if (svgImage) {
             // display the SVG image
             await displaySvgDecoration(