[latexila] Avoid warning when deleting nonexistent file

[SÃbastien Wilmet <swilmet src gnome org>]

commit 6b91ec50b12e7c2b5951008e859123dc40f69970
Author: SÃbastien Wilmet <swilmet src gnome org>
Date:   Sat Mar 10 22:07:46 2012 +0100

    Avoid warning when deleting nonexistent file

 src/utils.vala |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/utils.vala b/src/utils.vala
index 59ba1ef..1adfdb6 100644
--- a/src/utils.vala
+++ b/src/utils.vala
@@ -154,6 +154,9 @@ namespace Utils
 
     public void delete_file (File file)
     {
+        if (! file.query_exists ())
+            return;
+
         try
         {
             file.delete ();