I am having the same problem (and others) since the new launcher came out. It keeps getting dismissed because I have no crash reports to attach. I guess it technically doesn't crash, it just freezes.
I had the same issue. There is nothing to attach because Minecraft itself never launches: hence, no crash report. Unless there is a crash report for the launcher itself, which I know nothing about...
There is no crash report, like I said above. I know how to find a crash report; there aren't any. Minecraft fails to launch, so there are no reports! You'd need a crash report or log for the launcher itself.