Fixed: tns update crashes with error message (#2421)

Author: tzraikov

lib/commands/update.ts

@@ -9,6 +9,7 @@ export class UpdateCommand implements ICommand {
 		private $platformsData: IPlatformsData,
 		private $pluginsService: IPluginsService,
 		private $projectDataService: IProjectDataService,
+		private $fs: IFileSystem,
 		private $logger: ILogger) { }
 
 	public async execute(args: string[]): Promise<void> {
@@ -20,7 +21,10 @@ export class UpdateCommand implements ICommand {
 			shelljs.mkdir(tmpDir);
 			shelljs.cp(path.join(this.$projectData.projectDir, "package.json"), tmpDir);
 			for (let folder of folders) {
-				shelljs.cp("-rf", path.join(this.$projectData.projectDir, folder), tmpDir);
+				let folderToCopy = path.join(this.$projectData.projectDir, folder);
+				if (this.$fs.exists(folderToCopy)) {
+					shelljs.cp("-rf", folderToCopy, tmpDir);
+				}
 			}
 		} catch (error) {
 			this.$logger.error("Could not backup project folders!");
@@ -33,7 +37,12 @@ export class UpdateCommand implements ICommand {
 			shelljs.cp("-f", path.join(tmpDir, "package.json"), this.$projectData.projectDir);
 			for (let folder of folders) {
 				shelljs.rm("-rf", path.join(this.$projectData.projectDir, folder));
-				shelljs.cp("-fr", path.join(tmpDir, folder), this.$projectData.projectDir);
+
+				let folderToCopy = path.join(tmpDir, folder);
+
+				if (this.$fs.exists(folderToCopy)) {
+					shelljs.cp("-fr", folderToCopy, this.$projectData.projectDir);
+				}
 			}
 
 			this.$logger.error("Could not update the project!");