Fix trim() error on undefined values in template providers

Co-authored-by: MicroFish91 <40250218+MicroFish91@users.noreply.github.com>

Author: Copilot

src/templates/TemplateProviderBase.ts

@@ -106,7 +106,12 @@ export abstract class TemplateProviderBase implements Disposable {
     }
 
     public async getBackupTemplateVersion(): Promise<string> {
-        return (await AzExtFsExtra.readFile(await this.getBackupVersionPath())).toString().trim();
+        const versionPath = await this.getBackupVersionPath();
+        if (await AzExtFsExtra.pathExists(versionPath)) {
+            const content = await AzExtFsExtra.readFile(versionPath);
+            return content ? content.toString().trim() : '';
+        }
+        return '';
     }
 
     public async updateBackupTemplateVersion(version: string): Promise<void> {

src/templates/java/JavaTemplateProvider.ts

@@ -37,7 +37,11 @@ export class JavaTemplateProvider extends ScriptTemplateProvider {
     public async getLatestTemplateVersion(): Promise<string> {
         this.validateGradleProject();
         const pomPath: string = path.join(this.getProjectPath(), pomXmlFileName);
-        const pomContents: string = (await AzExtFsExtra.readFile(pomPath)).toString();
+        const pomFileContent = await AzExtFsExtra.readFile(pomPath);
+        if (!pomFileContent) {
+            throw new Error(localize('failedToReadPom', 'Failed to read pom.xml file.'));
+        }
+        const pomContents: string = pomFileContent.toString();
         const match: RegExpMatchArray | null = pomContents.match(/<azure.functions.maven.plugin.version>(.*)<\/azure.functions.maven.plugin.version>/i);
         if (!match) {
             throw new Error(localize('failedToDetectPluginVersion', 'Failed to detect Azure Functions maven plugin version.'));