Hide empty conversations in home view.

// FREEBIE

SignalServiceKit/src/Storage/TSDatabaseView.h

@@ -25,8 +25,7 @@ extern NSString *const TSSecondaryDevicesDatabaseViewExtensionName;
 
 + (BOOL)hasPendingViewRegistrations;
 
-// This method must be called _AFTER_ registerThreadInteractionsDatabaseView.
-+ (void)asyncRegisterThreadDatabaseView;
++ (void)registerThreadDatabaseView;
 
 + (void)registerThreadInteractionsDatabaseView;
 + (void)asyncRegisterThreadOutgoingMessagesDatabaseView;

SignalServiceKit/src/Storage/TSDatabaseView.m

@@ -207,7 +207,7 @@ NSString *const TSSecondaryDevicesDatabaseViewExtensionName = @"TSSecondaryDevic
                                         async:YES];
 }
 
-+ (void)asyncRegisterThreadDatabaseView
++ (void)registerThreadDatabaseView
 {
     YapDatabaseView *threadView =
         [[TSStorageManager sharedManager].database registeredExtension:TSThreadDatabaseViewExtensionName];
@@ -249,15 +249,8 @@ NSString *const TSSecondaryDevicesDatabaseViewExtensionName = @"TSSecondaryDevic
     YapDatabaseView *databaseView =
         [[YapDatabaseView alloc] initWithGrouping:viewGrouping sorting:viewSorting versionTag:@"2" options:options];
 
-    [[TSStorageManager sharedManager].database
-        asyncRegisterExtension:databaseView
-                      withName:TSThreadDatabaseViewExtensionName
-               completionBlock:^(BOOL ready) {
-                   OWSCAssert(ready);
-
-                   DDLogInfo(
-                       @"%@ asyncRegisterExtension: %@ -> %d", self.tag, TSThreadDatabaseViewExtensionName, ready);
-               }];
+    [[TSStorageManager sharedManager].database registerExtension:databaseView
+                                                        withName:TSThreadDatabaseViewExtensionName];
 }
 
 /**

SignalServiceKit/src/Storage/TSStorageManager.m

@@ -192,6 +192,7 @@ static NSString *keychainDBPassAccount    = @"TSDatabasePass";
 - (void)setupDatabaseWithSafeBlockingMigrations:(void (^_Nonnull)())safeBlockingMigrationsBlock
 {
     // Synchronously register extensions which are essential for views.
+    [TSDatabaseView registerThreadDatabaseView];
     [TSDatabaseView registerThreadInteractionsDatabaseView];
     [TSDatabaseView registerUnreadDatabaseView];
     [self.database registerExtension:[TSDatabaseSecondaryIndexes registerTimeStampIndex] withName:@"idx"];
@@ -209,7 +210,6 @@ static NSString *keychainDBPassAccount    = @"TSDatabasePass";
     //
     // All sync registrations must be done before all async registrations,
     // or the sync registrations will block on the async registrations.
-    [TSDatabaseView asyncRegisterThreadDatabaseView];
     [TSDatabaseView asyncRegisterUnseenDatabaseView];
     [TSDatabaseView asyncRegisterThreadOutgoingMessagesDatabaseView];
     [TSDatabaseView asyncRegisterThreadSpecialMessagesDatabaseView];