fix api issues

Author: Haehnchen

src/main/java/fr/adrienbrault/idea/symfony2plugin/templating/TwigTemplateCompletionContributor.java

@@ -564,7 +564,7 @@ protected void addCompletions(@NotNull CompletionParameters parameters, Processi
                 return;
             }
 
-            resultSet.addAllElements(TwigUtil.getTwigLookupElements(parameters.getPosition().getProject(), Collections.emptyList()));
+            resultSet.addAllElements(TwigUtil.getTwigLookupElements(parameters.getPosition().getProject()));
         }
     }
 

src/main/java/fr/adrienbrault/idea/symfony2plugin/templating/util/TwigUtil.java

@@ -1524,7 +1524,14 @@ public static Collection<PsiElement> getTwigMacroTargets(final Project project,
 
     /**
      * Lookup elements for Twig files
-     * @return
+     */
+    @NotNull
+    public static Collection<LookupElement> getTwigLookupElements(@NotNull Project project) {
+        return getTwigLookupElements(project, Collections.emptyList());
+    }
+
+    /**
+     * Lookup elements for Twig files
      */
     @NotNull
     public static Collection<LookupElement> getTwigLookupElements(@NotNull Project project, @NotNull Collection<String> highlight) {