code: private Map<Object, CacheItem> getScopeCache(String scope) throws InvalidScopeException {
          Map<Object, CacheItem> scopeCache = scopeCaches.get(scope);
          if (scopeCache == null) {
              throw new InvalidScopeException("The scope " + scope + " doesn't exist");
          } else {
              return scopeCache;
          }
      }
docs: Returns the {@link Map} object associated with the given scope.
  
  @throws org.craftercms.core.exception.InvalidScopeException
  if the specified scope isn't a registered one