Fixes crash in case of missing of the partial KeyPath in NSDictionary

NSDictionary+Values.m

@implementation NSDictionary (Values)
 
- (id)valueForKeyPath:(NSString *)keyPath
{
    __block id value = nil;
     
    if (keyPath != nil) {
        NSArray *keys = [keyPath componentsSeparatedByString:@"."];
        if (keys && [keys count] > 0) {
            [keys enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                value = idx == 0 ? [self objectForKey:obj] : [value objectForKey:obj];
                if (value == nil || ![value isKindOfClass:[NSDictionary class]])
                        *stop = YES;
            }];
        }
    }
     
    return value;
}