2.5

Two bugfixes, reported by Sebastian Skejo in IRC:

- File operator poll wasn't secure, search for it crashed
- Knife tool depends on having view3d context, fixed poll for it

source/blender/editors/interface/interface_regions.c

@@ -748,12 +748,14 @@ void ui_searchbox_autocomplete(bContext *C, ARegion *ar, uiBut *but, char *str)
 {
 	uiSearchboxData *data= ar->regiondata;
 
+	if(str[0]) {
 		data->items.autocpl= autocomplete_begin(str, ui_get_but_string_max_length(but));
 
 		but->search_func(C, but->search_arg, but->editstr, &data->items);
 
 		autocomplete_end(data->items.autocpl, str);
 		data->items.autocpl= NULL;
+	}
 }
 
 static void ui_searchbox_region_draw(const bContext *C, ARegion *ar)

source/blender/editors/mesh/editmesh_loop.c

@@ -723,7 +723,7 @@ void MESH_OT_knife_cut(wmOperatorType *ot)
 	ot->modal= WM_gesture_lines_modal;
 	ot->exec= knife_cut_exec;
 	
-	ot->poll= ED_operator_editmesh;
+	ot->poll= EM_view3d_poll;
 	
 	/* flags */
 	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

source/blender/editors/space_file/file_ops.c

@@ -933,7 +933,7 @@ int file_delete_poll(bContext *C)
 	SpaceFile *sfile= CTX_wm_space_file(C);
 	struct direntry* file;
 
-	if (sfile->params) {
+	if (sfile && sfile->params) {
 		if (sfile->params->active_file < 0) { 
 			poll= 0;
 		} else {