better handling of errors like "Warning: Network error #203: Error downloading https://suite410.boundless.test:8444/geoserver/web/rest/about/version.xml - server replied: Not Found"

[gioman]

When accessing Suite/Geoserver via web browser the base address is pretty much like (example):

https://suite410.boundless.test:8444/geoserver/web

If this is used in Geoserver Explorer (instead of the correct "https://suite410.boundless.test:8444/geoserver") this lead to errors/messages that are hard to decipher for the common user

"Warning: Network error #203: Error downloading https://suite410.boundless.test:8444/geoserver/web/rest/about/version.xml - server replied: Not Found"

I suggest to better handle those messages with better wording, a more evident warning dialog or even by "fixing" on the fly the URL.