fix out of range case in getParameterDefinition #368

Author: Haehnchen

src/fr/adrienbrault/idea/symfony2plugin/util/dict/ServiceUtil.java

@@ -60,7 +60,7 @@ public static PhpClass getResolvedClassDefinition(Project project, String servic
  */
  public static Collection<PsiElement> getParameterDefinition(Project project, String parameterName) {
 
- if(parameterName.startsWith("%") && parameterName.endsWith("%")) {
+ if(parameterName.length() > 2 && parameterName.startsWith("%") && parameterName.endsWith("%")) {
  parameterName = parameterName.substring(1, parameterName.length() - 1);
  }