fix error on showing dependency tree (#398)

* fix error on showing dependency tree

* update change log

CHANGELOG.md

@@ -2,8 +2,12 @@
 All notable changes to the "vscode-maven" extension will be documented in this file.
 
 ## 0.19.0
+#### Added 
 - Add inline action buttons in Maven explorer.
 
+#### Fixed
+- Cannot show dependencies.
+
 ## 0.18.2
 #### Fixed
 - Typo in Hover information. [#368](https://github.com/microsoft/vscode-maven/issues/368)

src/handlers/showDependenciesHandler.ts

@@ -34,8 +34,8 @@ async function getDependencyTree(pomPathOrMavenProject: string | MavenProject):
         async (resolve, reject): Promise<void> => {
             p.report({ message: `Generating Dependency Tree: ${name}` });
             try {
-                await rawDependencyTree(pomPath);
-                resolve();
+                const rawData: string | undefined = await rawDependencyTree(pomPath);
+                resolve(rawData);
                 return;
             } catch (error) {
                 setUserError(<Error>error);