[Ovmsdev] Crashes while flashing

[Craig Leres]

I think there might be a new problem with the code. The most common way 
for me to load new firmware is via the "Flash from web" from my system 
at home. Several times this weekend I've gotten "Request error, please 
retry" when starting the flash. Just now I got one half way through the 
flash. I haven't been able to get a useful stack trace because my 
build/ovms3.elf has already been overwritten with a new image when this 
happens and xtensa-esp32-elf-addr2line just prints a bunch of "??:0" 
lines. I've had this multiple times on two different modules today and 
so far 3 times in a row. I finally resorted to booting from the factory 
partition (which I try to keep loaded with the current public release). 
That resulted in it completely losing its config and firing up the OVMS 
ssid instead of joining my network.

I've attached some frame grabs.

		Craig
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