adding a NSCParameterAssert to prevent a fatal exception
adding a NSCParameterAssert to prevent a fatal exception

[changed] CWURL() now has a NSCParameterAssert for the url format. This
makes it so the function only throws an assertion when a nil url format
is passed in. Otherwise when forming the NSString that will be used for
making the URL an NSException is thrown and your app will probably
crash.

Machx/Zangetsu