Fix a bug in Modal when open() is called with no arguments and there's an onShow callback present.
Fix a bug in Modal when open() is called with no arguments and there's an onShow callback present.

rcarmo/Ink,pkdevbox/Ink,pedrocorreia/Ink,sapo/Ink,birthdayalex/Ink,rcarmo/Ink,birthdayalex/Ink,birthdayalex/Ink,sapo/Ink,pedrocorreia/Ink,pedrocorreia/Ink,rcarmo/Ink,pkdevbox/Ink,sapo/Ink,pkdevbox/Ink