Correct invalid address error handling in EditSideStakeDialog #1760

Job	Run time
Lint	1m 9s
ARM [GOAL install] [buster]	3m 2s
macOS 11 native [GOAL install] [GUI] [no depends]	16m 47s
Win32	5m 10s
Win64	5m 42s
i386 Linux [GOAL install] [focal]	3m 29s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	23m 8s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	23m 39s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	15m 47s
	1h 37m 53s

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