Add guard for empty string at port textfield in SftpConnectionDialog #4128
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Description
Issue tracker
Fixes #4122
Manual tests
Done
Device: Pixel 4a emulator
OS: Android 12
When connection is set up with server port at 22, editing connection should not crash the app
Build tasks success
Successfully running following tasks on local:
./gradlew assembledebug
./gradlew spotlessCheck
Related PR
Related to PR #4092 - cherry picked 88ac4ed to make tests pass