closes #290: merge in parts of @RubioV/RMMapBoxSource-offline-crash-fix

@@ -67,16 +67,10 @@ static RMConfiguration *RMConfigurationSharedInstance = nil;
 
 
     [request setValue:[[RMConfiguration configuration] userAgent] forHTTPHeaderField:@"User-Agent"];
     [request setValue:[[RMConfiguration configuration] userAgent] forHTTPHeaderField:@"User-Agent"];
 
 
-    NSError *internalError = nil;
-
-    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&internalError];
+    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:error];
 
 
     if ( ! returnData)
     if ( ! returnData)
-    {
-        *error = internalError;
-
         return nil;
         return nil;
-    }
 
 
     return [[[self class] alloc] initWithData:returnData encoding:enc];
     return [[[self class] alloc] initWithData:returnData encoding:enc];
 }
 }
@@ -117,13 +111,13 @@ static RMConfiguration *RMConfigurationSharedInstance = nil;
 
 
     RMLog(@"reading route-me configuration from %@", path);
     RMLog(@"reading route-me configuration from %@", path);
 
 
-    NSString *error = nil;
+    NSError *error = nil;
     NSData *plistData = [NSData dataWithContentsOfFile:path];
     NSData *plistData = [NSData dataWithContentsOfFile:path];
 
 
-    _propertyList = [NSPropertyListSerialization propertyListFromData:plistData
-                                                     mutabilityOption:NSPropertyListImmutable
+    _propertyList = [NSPropertyListSerialization propertyListWithData:plistData
+                                                              options:NSPropertyListImmutable
                                                                format:NULL
                                                                format:NULL
-                                                     errorDescription:&error];
+                                                                error:&error];
 
 
     if ( ! _propertyList)
     if ( ! _propertyList)
     {
     {

@@ -79,6 +79,8 @@
         _infoDictionary = (NSDictionary *)[NSJSONSerialization JSONObjectWithData:[tileJSON dataUsingEncoding:NSUTF8StringEncoding]
         _infoDictionary = (NSDictionary *)[NSJSONSerialization JSONObjectWithData:[tileJSON dataUsingEncoding:NSUTF8StringEncoding]
                                                                           options:0
                                                                           options:0
                                                                             error:nil];
                                                                             error:nil];
+        if ( ! _infoDictionary)
+            return nil;
 
 
         _tileJSON = tileJSON;
         _tileJSON = tileJSON;
 
 
@@ -174,7 +176,8 @@
 
 
 - (void)dealloc
 - (void)dealloc
 {
 {
-    dispatch_release(_dataQueue);
+    if (_dataQueue)
+        dispatch_release(_dataQueue);
 }
 }
 
 
 #pragma mark 
 #pragma mark