Avoid blocking app launch

// FREEBIE

src/Account/TSAccountManager.h

@@ -21,8 +21,8 @@ typedef void (^failedBlock)(NSError *error);
  *
  *  @return registered or not
  */
-
 + (BOOL)isRegistered;
++ (void)runIfRegistered:(void (^)())block;
 
 /**
  *  Returns registered number

src/Account/TSAccountManager.m

@@ -40,6 +40,11 @@
     return [TSStorageManager localNumber] ? YES : NO;
 }
 
++ (void)runIfRegistered:(void (^)())block
+{
+    [[TSStorageManager sharedManager] runIfHasLocalNumber:block];
+}
+
 + (void)didRegister {
     TSAccountManager *sharedManager = [self sharedInstance];
     __strong NSString *phoneNumber  = sharedManager.phoneNumberAwaitingVerification;

src/Storage/TSStorageManager+keyingMaterial.h

@@ -33,8 +33,8 @@
  *
  *  @return E164 string of the registered phone number
  */
-
 + (NSString *)localNumber;
+- (void)runIfHasLocalNumber:(void (^)())block;
 
 + (void)storeServerToken:(NSString *)authToken signalingKey:(NSString *)signalingKey;
 

src/Storage/TSStorageManager+keyingMaterial.m

@@ -14,6 +14,17 @@
     return [[self sharedManager] stringForKey:TSStorageRegisteredNumberKey inCollection:TSStorageUserAccountCollection];
 }
 
+- (void)runIfHasLocalNumber:(void (^)())block
+{
+    [self.newDatabaseConnection asyncReadWithBlock:^(YapDatabaseReadTransaction *_Nonnull transaction) {
+        if ([transaction objectForKey:TSStorageRegisteredNumberKey inCollection:TSStorageUserAccountCollection]) {
+            block();
+        } else {
+            DDLogDebug(@"%@ Skipping block since no local number is registered", self.tag);
+        }
+    }];
+}
+
 + (NSString *)signalingKey {
     return [[self sharedManager] stringForKey:TSStorageServerSignalingKey inCollection:TSStorageUserAccountCollection];
 }
@@ -44,4 +55,16 @@
     }];
 }
 
+#pragma mark - Logging
+
++ (NSString *)tag
+{
+    return [NSString stringWithFormat:@"[%@]", self.class];
+}
+
+- (NSString *)tag
+{
+    return self.class.tag;
+}
+
 @end