Background rendering didn't work anymore!

- STUPID mistake from me in setting the waitcursor...
- icons for UI got freed, without checking if it existed (crash in end)
- call to close mainwindow didn't check if window existed

note:
I usually test the "blender -b" case, which should start blender,
initialize all, free all, and print "blender quit" to signal all is fine.

1 files changed, 4 insertions, 3 deletions

diff --git a/source/blender/blenkernel/intern/icons.c b/source/blender/blenkernel/intern/icons.c
index 9617902e057..ee37a4ec9f9 100644
--- a/source/blender/blenkernel/intern/icons.c
+++ b/source/blender/blenkernel/intern/icons.c
@@ -50,7 +50,7 @@
 
 /* GLOBALS */
 
-static GHash* gIcons = 0;
+static GHash* gIcons = NULL;
 
 static int gNextIconId = 1;
 
@@ -106,8 +106,9 @@ void BKE_icons_init(int first_dyn_id)
 
 void BKE_icons_free()
 {
-	BLI_ghash_free(gIcons, 0, icon_free);
-	gIcons = 0;
+	if(gIcons)
+		BLI_ghash_free(gIcons, 0, icon_free);
+	gIcons = NULL;
 }