Fixing crash on responding to phone call.

Signal/src/contact/ContactsManager.m

@@ -222,7 +222,7 @@ void onAddressBookChanged(ABAddressBookRef notifyAddressBook, CFDictionaryRef in
 }
 
 -(Contact*)latestContactForPhoneNumber:(PhoneNumber *)phoneNumber {
-    NSArray *allContacts = latestContactsById.allValues;
+    NSArray *allContacts = [self allContacts];
 
     ContactSearchBlock searchBlock = ^BOOL(Contact *contact, NSUInteger idx, BOOL *stop) {
         for (PhoneNumber *number in contact.parsedPhoneNumbers) {
@@ -336,7 +336,17 @@ void onAddressBookChanged(ABAddressBookRef notifyAddressBook, CFDictionaryRef in
 }
 
 - (NSArray*)allContacts {
-    return [latestContactsById allValues];
+    NSMutableArray *allContacts = [NSMutableArray array];
+    
+    for (NSString *key in latestContactsById.allKeys){
+        Contact *contact = [latestContactsById objectForKey:key];
+        
+        if ([contact isKindOfClass:[Contact class]]) {
+            [allContacts addObject:contact];
+        }
+    }
+    return allContacts;
+    
 }
 
 - (NSArray*)recordsForContacts:(NSArray*) contacts{

Signal/src/phone/signaling/SignalUtil.m

@@ -32,15 +32,27 @@
 }
 
 -(bool) isRingingForSession:(int64_t)targetSessionId {
-    return [self.method isEqualToString:@"RING"] && [@(targetSessionId) isEqualToNumber:self.tryGetSessionId];
+    NSNumber *sessionId = self.tryGetSessionId;
+    BOOL isMethod  = [self.method isEqualToString:@"RING"];
+    BOOL isSession = sessionId?[@(targetSessionId) isEqualToNumber:sessionId]:NO;
+    
+    return isMethod&&isSession;
 }
 
 -(bool) isHangupForSession:(int64_t)targetSessionId {
-    return [self.method isEqualToString:@"DELETE"] && self.tryGetSessionId?[@(targetSessionId) isEqualToNumber:self.tryGetSessionId]:NO;
+    NSNumber *sessionId = self.tryGetSessionId;
+    BOOL isMethod  = [self.method isEqualToString:@"DELETE"];
+    BOOL isSession = sessionId?[@(targetSessionId) isEqualToNumber:sessionId]:NO;
+    
+    return isMethod&&isSession;
 }
 
 -(bool) isBusyForSession:(int64_t)targetSessionId {
-    return [self.method isEqualToString:@"BUSY"] && [@(targetSessionId) isEqualToNumber:self.tryGetSessionId];
+    NSNumber *sessionId = self.tryGetSessionId;
+    BOOL isMethod  = [self.method isEqualToString:@"BUSY"];
+    BOOL isSession = sessionId?[@(targetSessionId) isEqualToNumber:sessionId]:NO;
+    
+    return isMethod&&isSession;
 }
 
 +(HttpRequest*) httpRequestToOpenPortWithSessionId:(int64_t)sessionId {

Signal/src/textsecure/Messages/TSMessagesManager.m

@@ -430,7 +430,9 @@
         TSContactThread *cThread = (TSContactThread*)thread;
         
         if (call.callType == RPRecentCallTypeMissed) {
-            [[UIApplication sharedApplication] cancelLocalNotification:notif];
+            if (notif) {
+                [[UIApplication sharedApplication] cancelLocalNotification:notif];
+            }
             
             UILocalNotification *notification = [[UILocalNotification alloc] init];
             notification.category   = Signal_CallBack_Category;

Signal/src/view controllers/MessagesViewController.m

@@ -796,6 +796,11 @@ typedef enum : NSUInteger {
         if([self.thread isKindOfClass:[TSGroupThread class]]) {
             NSString *name = [[Environment getCurrent].contactsManager nameStringForPhoneIdentifier:msg.senderId];
             name = name ? name : msg.senderId;
+            
+            if (!name) {
+                name = @"";
+            }
+            
             NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc]initWithString:name];
             [attrStr appendAttributedString:[NSAttributedString attributedStringWithAttachment:textAttachment]];