Respond to CR.

// FREEBIE

src/Storage/OWSOrphanedDataCleaner.m

@@ -31,6 +31,11 @@
 // * Orphan attachments (with no message).
 // * Orphan attachment files (with no attachment).
 // * Missing attachment files (cannot be cleaned up).
+//   These are attachments which have no file on disk.  They should be extremely rare -
+//   the only cases I have seen are probably due to debugging.
+//   They can't be cleaned up - we don't want to delete the TSAttachmentStream or
+//   its corresponding message.  Better that the broken message shows up in the
+//   conversation view.
 + (void)auditAndCleanup:(BOOL)shouldCleanup
 {
     NSString *attachmentsFolder = [TSAttachmentStream attachmentsFolder];
@@ -152,7 +157,10 @@
     // being created/written, so we don't clean up anything recent.
     const NSTimeInterval kMinimumOrphanAge = 15 * 60.f;
 
-    if (shouldCleanup) {
+    if (!shouldCleanup) {
+        return;
+    }
+
     [databaseConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *_Nonnull transaction) {
         for (NSString *interactionId in orphanInteractionIds) {
             TSInteraction *interaction = [TSInteraction fetchObjectWithUniqueID:interactionId];
@@ -207,7 +215,6 @@
         }
     }
 }
-}
 
 + (void)printPaths:(NSArray<NSString *> *)paths label:(NSString *)label
 {