[template-glib] eval: notify of missing String function

[Christian Hergert <chergert src gnome org>]

commit cadb84a8cf0781be9ea7c1f822454fdf9e8c98d5
Author: Christian Hergert <chergert redhat com>
Date:   Tue Aug 9 14:27:34 2016 -0700

    eval: notify of missing String function

 src/tmpl-expr-eval.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/tmpl-expr-eval.c b/src/tmpl-expr-eval.c
index 6fee993..49d671c 100644
--- a/src/tmpl-expr-eval.c
+++ b/src/tmpl-expr-eval.c
@@ -680,6 +680,14 @@ tmpl_expr_gi_call_eval (TmplExprGiCall  *node,
           g_value_take_string (return_value, make_title (str));
           ret = TRUE;
         }
+      else
+        {
+          g_set_error (error,
+                       TMPL_ERROR,
+                       TMPL_ERROR_GI_FAILURE,
+                       "No such method %s for string",
+                       node->name);
+        }
 
       goto cleanup;
     }