* Fix a crasher that could happen after dismissing an error alert.

* Remove delegation from the UIAlert used by NSError+LEPresenting.

## Analysis

It’s not a good idea to have instances of NSError serve as alert delegates, because they don’t stick around as long as the alert boxes do. It’s not necessary, either, as the method was just a stub.

Lemacs/Utilities/NSError+LEPresenting.h

@@ -7,6 +7,6 @@
 //
 //  This convenient method simply presents an alert displaying the localized error.
 
-@interface NSError (LEPresenting) <UIAlertViewDelegate>
+@interface NSError (LEPresenting)
 - (IBAction)present;
 @end

Lemacs/Utilities/NSError+LEPresenting.m

@@ -10,14 +10,6 @@
 
 @implementation NSError (LEPresenting)
 
-#pragma mark - UIAlertViewDelegate
-
-- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;
-{
-
-}
-
-
 #pragma mark - API
 
 - (IBAction)present;
@@ -41,7 +33,7 @@ - (IBAction)present;
 
     NSString *localizedCancelButtonTitle = NSLocalizedString(@"OK", @"Generic error button title");
 
-    UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:localizedTitle message:localizedMessage delegate:self cancelButtonTitle:localizedCancelButtonTitle otherButtonTitles:nil];
+    UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:localizedTitle message:localizedMessage delegate:nil cancelButtonTitle:localizedCancelButtonTitle otherButtonTitles:nil];
     [errorAlert show];
 }