Add default branch for checkstyle

Author: jasmith-hs

src/main/java/com/hubspot/jinjava/interpret/JinjavaInterpreter.java

@@ -849,6 +849,7 @@ public void addError(TemplateError templateError) {
           templateError.getMessage()
         );
       case ADD_ERROR:
+      default: // Checkstyle
         // fix line numbers not matching up with source template
         if (!context.getCurrentPathStack().isEmpty()) {
           if (