Fix crash on boot (#33)

A botched migration 6 months ago left some lingering TSRecipients
serialized in our data store, laying in wait to explode the next time we
enumerate every object in the database (e.g. when we add an index).

// FREEBIE

src/Storage/TSStorageManager.m

@@ -26,6 +26,29 @@ static NSString *keychainDBPassAccount    = @"TSDatabasePass";
 
 @end
 
+// Some lingering TSRecipient records in the wild causing crashes.
+// This is a stop gap until a proper cleanup happens.
+@interface TSRecipient : NSObject <NSCoding>
+
+@end
+
+@implementation TSRecipient
+
+- (instancetype)initWithCoder:(NSCoder *)aDecoder
+{
+    DDLogWarn(@"Ignoring decoding signal recipient with coder.");
+
+    self = [super init];
+    return nil;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder
+{
+    DDLogWarn(@"Ignoring encoding signal recipient with coder.");
+}
+
+@end
+
 @implementation TSStorageManager
 
 + (instancetype)sharedManager {
@@ -67,19 +90,21 @@ static NSString *keychainDBPassAccount    = @"TSDatabasePass";
         if (!data || data.length <= 0) {
             return nil;
         }
+
         @try {
             return [NSKeyedUnarchiver unarchiveObjectWithData:data];
         } @catch (NSException *exception) {
             // Sync log in case we bail.
-            NSLog(@"%@ Unarchiving key:%@ from collection:%@ and data %@ failed with error: %@",
-                [self tag],
+            DDLogError(@"%@ Unarchiving key:%@ from collection:%@ and data %@ failed with error: %@",
+                self.tag,
                 key,
                 collection,
                 data,
                 exception.reason);
-            // Sync log in case we bail.
-            NSLog(@"%@ Raising exception since deserialization failed", [self tag]);
-            [exception raise];
+            DDLogError(@"%@ Raising exception.", self.tag);
+            @throw exception;
+            //            DDLogWarn(@"%@ Ignoring exception.", self.tag);
+            //            return nil;
         }
     };
 }
@@ -100,13 +125,11 @@ static NSString *keychainDBPassAccount    = @"TSDatabasePass";
     // Seeing this raise an exception-on-boot for some users, making it impossible to get any good data.
     @try {
         [OWSReadReceipt registerIndexOnSenderIdAndTimestampWithDatabase:self.database];
-    }
-    @catch (NSException *exception) {
+    } @catch (NSException *exception) {
         DDLogError(@"%@ Failed to register read receipt index with exception: %@ with reason: %@", self.tag, exception, exception.reason);
     }
 }
 
-
 - (void)protectSignalFiles {
     [self protectFolderAtPath:[TSAttachmentStream attachmentsFolder]];
     [self protectFolderAtPath:[self dbPath]];
@@ -321,6 +344,8 @@ static NSString *keychainDBPassAccount    = @"TSDatabasePass";
     [[self init] setupDatabase];
 }
 
+#pragma mark - Logging
+
 + (NSString *)tag
 {
     return [NSString stringWithFormat:@"[%@]", self.class];