chore: fix doc telemetry changes fail CI issue

Author: KevinDing1

plugins/amazonq/chat/jetbrains-community/src/software/aws/toolkits/jetbrains/services/amazonqDoc/session/DocSession.kt

@@ -50,7 +50,7 @@ class DocSession(val tabID: String, val project: Project) {
     var task: String = ""
     val proxyClient: AmazonQCodeGenerateClient
     val amazonQCodeGenService: AmazonQCodeGenService
-    private var _reportedChanges = mutableMapOf<String, String>()
+    private val _reportedChanges = mutableMapOf<String, String>()
 
     // retry session state vars
     private var codegenRetries: Int
@@ -161,7 +161,7 @@ class DocSession(val tabID: String, val project: Project) {
             } else {
                 val sourceContent = reportedChange
                     ?: VfsUtil.findRelativeFile(filePath.zipFilePath, context.selectedSourceFolder)?.content()
-                    ?: ""
+                        .orEmpty()
                 val diffMetrics = getDiffMetrics(sourceContent, content)
                 totalAddedLines += diffMetrics.insertedLines
                 totalAddedChars += diffMetrics.insertedCharacters
@@ -188,7 +188,7 @@ class DocSession(val tabID: String, val project: Project) {
                 totalAddedLines += content.split('\n').size
             } else {
                 val existingFileContent = VfsUtil.findRelativeFile(filePath.zipFilePath, context.selectedSourceFolder)?.content()
-                val diffMetrics = getDiffMetrics(existingFileContent ?: "", content)
+                val diffMetrics = getDiffMetrics(existingFileContent.orEmpty(), content)
                 totalAddedLines += diffMetrics.insertedLines
                 totalAddedChars += diffMetrics.insertedCharacters
             }
@@ -277,10 +277,13 @@ class DocSession(val tabID: String, val project: Project) {
     ) {
         val sendDocTelemetryEventResponse: SendTelemetryEventResponse
         try {
-            when {
-                generationEvent != null -> sendDocTelemetryEventResponse = proxyClient.sendDocTelemetryEvent(generationEvent, null)
-                acceptanceEvent != null -> sendDocTelemetryEventResponse = proxyClient.sendDocTelemetryEvent(null, acceptanceEvent)
-                else -> throw IllegalArgumentException("Either generation or acceptance event must be provided")
+            sendDocTelemetryEventResponse = when {
+                generationEvent != null -> proxyClient.sendDocTelemetryEvent(generationEvent, null)
+                acceptanceEvent != null -> proxyClient.sendDocTelemetryEvent(null, acceptanceEvent)
+                else -> {
+                    logger.warn("Neither generation nor acceptance event was provided")
+                    return
+                }
             }
             val requestId = sendDocTelemetryEventResponse.responseMetadata().requestId()
             logger.debug {