[SDLRPCStruct initWithDictionary] does not check for a nil dictionary

[jacobkeeler]

In [SDLRPCStruct initWithDictionary], there is no check whether the passed in dictionary is nil.

-(id) initWithDictionary:(NSMutableDictionary*) dict {
    if (self = [super init]) {
        store = dict;
    }
    return self;
}

This means that if any such object is initialized with a nil dictionary, then its properties cannot be edited.

There should be a check to see whether the passed in dictionary is nil, and if it is, then store should just be initialized with an empty dictionary.

-(id) initWithDictionary:(NSMutableDictionary*) dict {
    if (self = [super init]) {
        if (dict == nil) {
            store = [[NSMutableDictionary alloc] init];
        } else {
            store = dict;
        }
    }
    return self;
}

See also: #75

[joeljfischer]

Could use -initWithDictionary which if passed nil will create an empty dict.