fixed makepot task

- added proper grunt module (grunt-cli)
- updated translations extract code to remove warnings when no translations are found

RoboFile.php

@@ -89,14 +89,14 @@ class RoboFile extends \Robo\Tasks {
   }
 
   function makepot() {
-    $this->_exec('grunt makepot'.
+    $this->_exec('./node_modules/.bin/grunt makepot'.
       ' --gruntfile '.__DIR__.'/tasks/makepot/makepot.js'.
       ' --base_path '.__DIR__
     );
   }
 
   function pushpot() {
-    $this->_exec('grunt pushpot'.
+    $this->_exec('./node_modules/.bin/grunt pushpot'.
       ' --gruntfile '.__DIR__.'/tasks/makepot/makepot.js'.
       ' --base_path '.__DIR__
     );
@@ -123,7 +123,7 @@ class RoboFile extends \Robo\Tasks {
     $this->compileJs();
 
     $this->_exec(join(' ', array(
-      './node_modules/mocha/bin/mocha',
+      './node_modules/.bin/mocha',
       '-r tests/javascript/mochaTestHelper.js',
       'tests/javascript/testBundles/**/*.js'
     )));

package.json

@@ -45,7 +45,7 @@
     "amd-inject-loader": "latest",
     "chai": "2.2.0",
     "chai-jq": "0.0.8",
-    "grunt": "^0.4.5",
+    "grunt-cli": "latest",
     "jquery": "2.1.4",
     "jsdom": "3.1.2",
     "mocha": "2.2.1",

tasks/makepot/node_modules/grunt-wp-i18n/vendor/wp-i18n-tools/extract.php

@@ -178,9 +178,10 @@ class StringExtractor {
 	 *  - line - line number
 	 */
 	public function find_function_calls( $function_names, $code, $extension = '.php') {
+		$function_calls = array();
+
 		if($extension === 'php') {
 			$tokens = token_get_all( $code );
-			$function_calls = array();
 			$latest_comment = false;
 			$in_func = false;
 			foreach( $tokens as $token ) {