Add possible fixes for the ‘empty home view’ issue.

// FREEBIE

Signal/src/ViewControllers/SignalsViewController.m

@@ -415,7 +415,15 @@
 
 - (void)setShouldObserveDBModifications:(BOOL)shouldObserveDBModifications
 {
-    if (!_shouldObserveDBModifications && shouldObserveDBModifications && self.threadMappings != nil) {
+    _shouldObserveDBModifications = shouldObserveDBModifications;
+
+    [self ensureObserveDBModifications];
+}
+
+- (void)ensureObserveDBModifications
+{
+    if (self.shouldObserveDBModifications) {
+        if (self.threadMappings != nil) {
             // Before we begin observing database modifications, make sure
             // our mapping and table state is up-to-date.
             //
@@ -425,19 +433,17 @@
             [self.uiDatabaseConnection readWithBlock:^(YapDatabaseReadTransaction *transaction) {
                 [self.threadMappings updateWithTransaction:transaction];
             }];
+        }
 
         [[self tableView] reloadData];
     }
 
-    _shouldObserveDBModifications = shouldObserveDBModifications;
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:YapDatabaseModifiedNotification object:nil];
-
+    if (self.shouldObserveDBModifications) {
-    if (shouldObserveDBModifications) {
         [[NSNotificationCenter defaultCenter] addObserver:self
                                                  selector:@selector(yapDatabaseModified:)
                                                      name:YapDatabaseModifiedNotification
                                                    object:nil];
-    } else {
-        [[NSNotificationCenter defaultCenter] removeObserver:self name:YapDatabaseModifiedNotification object:nil];
     }
 
     [self checkIfEmptyView];