jooby:run fails when eclipse is present fix #358

Author: jknack

jooby-maven-plugin/src/main/java/org/jooby/JoobyMojo.java

@@ -197,7 +197,9 @@ public void execute() throws MojoExecutionException, MojoFailureException {
      */
     Runtime.getRuntime().addShutdownHook(shutdownHook);
 
-    watcher.start();
+    if (watcher != null) {
+      watcher.start();
+    }
 
     /**
      * Start process