Fixed some rare crashes.

[FIXED]     Crash for users with no name.
[FIXED]     Crash when copying an element with no content.

MasterPassword/MPAppDelegate_Key.m

@@ -16,8 +16,10 @@
 static NSDictionary *keyQuery(MPUserEntity *user) {
 
     return [PearlKeyChain createQueryForClass:kSecClassGenericPassword
-                                   attributes:@{(__bridge id)kSecAttrService: @"Saved Master Password",
+                                   attributes:@{
-                                                             (__bridge id)kSecAttrAccount: user.name}
+                                   (__bridge id)kSecAttrService: @"Saved Master Password",
+                                   (__bridge id)kSecAttrAccount: IfNotNilElse(user.name, @"")
+                                   }
                                       matches:nil];
 }
 

MasterPassword/iOS/MPMainViewController.m

@@ -485,11 +485,13 @@
 
 - (IBAction)copyContent {
 
-    if (!self.activeElement)
+    id content = self.activeElement.content;
+    if (!content)
+        // Nothing to copy.
         return;
 
     inf(@"Copying password for: %@", self.activeElement.name);
-    [UIPasteboard generalPasteboard].string = [self.activeElement.content description];
+    [UIPasteboard generalPasteboard].string = [content description];
 
     [self showContentTip:@"Copied!" withIcon:nil];
 

MasterPassword/iOS/MPUnlockViewController.m

@@ -554,6 +554,10 @@
 
 - (void)tryMasterPassword {
 
+    if (!self.selectedUser)
+        // No user selected, can't try sign-in.
+        return;
+
     [self setSpinnerActive:YES];
 
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{