Bugfix: calling getConfig() removed mergeCells NODEs
Bugfix: calling getConfig() removed mergeCells NODEs

Change in 7fbee25e37ccde9c8a848d438d99a3510dc1c597 broke `setMerge()` and `removeMerge()`
You shouldn't really store NODEs in table options, I already ran in plenty of issues with this..
paulhodel/jexcel,paulhodel/jexcel