fix(#195): provide default values for concatenatedProperties #217
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closes #195
This issue affects IE 11 which is still being supported for quite some time. It seems somehow to be related to emberjs/ember.js#14264 , though that particular issue was fixed. @PrzemoRevolve found a work around, but instead of adding empty strings for the concatenated properties every time modal-dialog is used, the work around can be implemented inside basic-dialog.js by adding default values of empty arrays to those properties.
@lukemelia this works on IE 11,
do you think it will cause any unwanted side effects?with null values instead of empty arrays (which I tried first) I don't think it should cause any side effects.