Fixed Xcode warnings

resolved #518, #519. thanks @funnel20.

Author: futuretap

Sources/InAppSettingsKit/Controllers/IASKAppSettingsViewController.m

@@ -1355,7 +1355,7 @@ - (void)userDefaultsDidChange {
             NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
 			if ([cell isKindOfClass:[IASKPSTextFieldSpecifierViewCell class]] && [((IASKPSTextFieldSpecifierViewCell*)cell).textField isFirstResponder] && indexPath) {
 				[indexPathsToUpdate removeObject:indexPath];
-			} else if ([cell isKindOfClass:IASKEmbeddedDatePickerViewCell.class] && !((IASKEmbeddedDatePickerViewCell*)cell).datePicker.editing) {
+			} else if ([cell isKindOfClass:IASKEmbeddedDatePickerViewCell.class] && !((IASKEmbeddedDatePickerViewCell*)cell).datePicker.editing && indexPath) {
 				[indexPathsToUpdate removeObject:indexPath];
 			}
 		}

Sources/InAppSettingsKit/Controllers/IASKAppSettingsWebViewController.m

@@ -117,7 +117,7 @@ - (void)loadView {
 	}
 	else {
 		// Fallback on earlier versions:
-		self.backButton = [[UIBarButtonItem alloc] initWithTitle:@" < "
+		self.backButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@" < ", @"No translation needed, silence Xcode warning")
 														   style:UIBarButtonItemStylePlain
 														  target:self
 														  action:@selector(goBack)];
@@ -131,7 +131,7 @@ - (void)loadView {
 	}
 	else {
 		// Fallback on earlier versions:
-		self.forwardButton = [[UIBarButtonItem alloc] initWithTitle:@" > "
+		self.forwardButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@" > ", @"No translation needed, silence Xcode warning")
 															  style:UIBarButtonItemStylePlain
 															 target:self
 															 action:@selector(goForward)];