fix(codewhisperer): filter out blank code chunk (#3642)

Author: Will-ShaoHua

.changes/next-release/Bug Fix-16b028ca-252d-4bbe-9702-a3566377aa9b.json

@@ -0,0 +1,4 @@
+{
+	"type": "Bug Fix",
+	"description": "codewhisperer: improper request format when sending empty supplemental context"
+}

src/codewhisperer/util/supplementalContext/crossFileContextUtil.ts

@@ -68,7 +68,10 @@ export async function fetchSupplementalContextForSrc(
         })
     }
 
-    return supplementalContexts
+    // DO NOT send code chunk with empty content
+    return supplementalContexts.filter(item => {
+        item.content.trim().length !== 0
+    })
 }
 
 function findBestKChunkMatches(chunkInput: Chunk, chunkReferences: Chunk[], k: number): Chunk[] {

src/codewhisperer/util/supplementalContext/utgUtils.ts

@@ -77,8 +77,10 @@ function generateSupplementalContextFromFocalFile(
 ): CodeWhispererSupplementalContextItem[] {
     const fileContent = fs.readFileSync(vscode.Uri.file(filePath!).fsPath, 'utf-8')
 
-    // TODO (Metrics) Publish fileContent.lenth to record the length of focal files observed.
-    // We prepend the content with 'UTG' to inform the server side.
+    // DO NOT send code chunk with empty content
+    if (fileContent.trim().length === 0) {
+        return []
+    }
 
     return [
         {