macosx: fix crash when displaying the Media Information panel with disabled local stats

(cherry picked from commit a44da88b77a1fe47f5e49c11106261d8b50315f8)

Conflicts:
	modules/gui/macosx/playlistinfo.m

modules/gui/macosx/playlistinfo.h

@@ -100,6 +100,7 @@
     input_item_t * p_item;
 
     BOOL b_awakeFromNib;
+    BOOL b_stats;
 }
 
 - (void)initPanel;

modules/gui/macosx/playlistinfo.m

@@ -140,14 +140,14 @@ static VLCInfo *_o_sharedInstance = nil;
 
 - (void)initPanel
 {
-    BOOL b_stats = config_GetInt(VLCIntf, "stats");
-    if( !b_stats )
-    {
+    b_stats = config_GetInt(VLCIntf, "stats");
+    if( !b_stats ) {
         if( [o_tab_view numberOfTabViewItems] > 2 )
             [o_tab_view removeTabViewItem: [o_tab_view tabViewItemAtIndex: 2]];
     }
-
+    else
         [self initMediaPanelStats];
+
     [o_info_window makeKeyAndOrderFront: self];
 }
 
@@ -280,7 +280,7 @@ static VLCInfo *_o_sharedInstance = nil;
 
 - (void)updateStatistics
 {
-    if (!b_awakeFromNib)
+    if (!b_awakeFromNib || !b_stats)
         return;
 
     if ([o_info_window isVisible])