fix

GMPhobos/Classes/PhobosUtil.m

@@ -168,6 +168,8 @@
  *  @since 0.0.1
  */
 + (NSData *)encodeJSON:(id)obj {
+    //有时第一次安装时因为obj=nil carsh
+    if (obj == nil) return nil;
     NSData *data = [NSJSONSerialization dataWithJSONObject:obj options:0 error:nil];
     return data;
 }