Fix several iOS crashes

Core/cheats.c

@@ -223,6 +223,7 @@ void GB_update_cheat(GB_gameboy_t *gb, const GB_cheat_t *_cheat, const char *des
     }
     
     assert(cheat);
+    if (!cheat) return;
     
     if (cheat->address != address) {
         /* Remove from old bucket */

iOS/GBROMViewController.m

@@ -9,6 +9,7 @@
 {
     NSIndexPath *_renamingPath;
     NSArray *_roms;
+    __weak UIAlertController *_alertToRemove;
 }
 
 - (instancetype)init
@@ -204,6 +205,7 @@
     [alert addAction:[UIAlertAction actionWithTitle:@"Cancel"
                                               style:UIAlertActionStyleCancel
                                             handler:nil]];
+    _alertToRemove = alert; // indexPath becoomes invalid if we reload, dismiss the alert if it happens
     [self presentViewController:alert animated:true completion:nil];
 }
 
@@ -321,6 +323,9 @@ contextMenuConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath
     // Do not auto-reload if busy
     if (self.view.window.userInteractionEnabled) {
         [self.tableView reloadData];
+        if (self.presentedViewController == _alertToRemove) {
+            [self dismissViewControllerAnimated:true completion:nil];
+        }
     }
 }
 

iOS/GBSettingsViewController.m

@@ -506,7 +506,7 @@ static UIImage *ImageForController(GCController *controller)
 static NSString *LocalizedNameForElement(GCControllerElement *element, GBControllerUsage usage)
 {
     if (@available(iOS 14.0, *)) {
-        return element.localizedName;
+        return element.localizedName ?: @"Unknown Button";
     }
     switch (usage) {
         case GBUsageDpad: return @"D-Pad";

iOS/GBViewController.m

@@ -731,9 +731,16 @@ static void rumbleCallback(GB_gameboy_t *gb, double amp)
             }
             
             NSDate *date = nil;
-            [[NSURL fileURLWithPath:[GBROMManager sharedManager].autosaveStateFile] getResourceValue:&date
-                                                                                              forKey:NSURLContentModificationDateKey
-                                                                                               error:nil];
+            @try {
+                [[NSURL fileURLWithPath:[GBROMManager sharedManager].autosaveStateFile] getResourceValue:&date
+                                                                                                  forKey:NSURLContentModificationDateKey
+                                                                                                   error:nil];
+            }
+            @catch (NSException *exception) {
+                /* fileURLWithPath: throws an exception on some crash logs. I don't know why or how to reproduce it,
+                   but let's at least not crash. */
+                GB_rewind_reset(&_gb);
+            }
             
             // Reset the rewind buffer only if we switched ROMs or had the save state change externally
             if (![_lastSavedROM isEqual:[GBROMManager sharedManager].currentROM] ||