Description of problem: When cloning channel via WebUI, it's possible to set an arch of the cloned channel to be incompatible to the original channel. Version-Release number of selected component (if applicable): sat540 How reproducible: always Steps to Reproduce: 1. take a x86_64 base channel and clone it to a s390x channel Actual results: Succeed. Expected results: This shall fail. The only exception could be to clone a i386 channel to a x86_64, but not really required. Additional info: this is a pxt pages issue