public static <K, V> V getValue(Map<K, V> map, K key, V defaultValue) {
		V v = map.get(key);
		if (v == null) {
			return defaultValue;
		}
		return v;
	}
Get the value from the map for the given key. It the value does not exist, return the given
defaultValue.

@param <K>          key type
@param <V>          value type
@param map          map
@param key          key
@param defaultValue default value if the value is null.
@return value
ngrinder-core/src/main/java/org/ngrinder/common/util/CollectionUtils.java