Enabled the removal of a trailing slash

[cmonr]

Description

Discovered when debugging #8246. Using basename with a URL that has a trailing slash leads to an empty string.

Pull request type

[x] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Breaking change

[studavekar]

Failure looks like is at https://github.com/ARMmbed/mbed-os/blob/master/tools/test/examples/examples_lib.py#L355

File "/builds/ws/mbed-os-build-matrix/3171/DELTA_DFBM_NQ620_IAR/sources/mbed-os/tools/test/examples/examples_lib.py", line 355, in compile_repos

yeah but root cause maybe its not able to deploy

[cmonr]

Hmmm, will take another look at this tomorrow. There might have been two bugs: 1) URLs with a trailing slash would be skipped, and 2) if the name was empty, it fails to change directories when deploying.

[0xc0170]

@ARMmbed/mbed-os-tools Please review (or update the PR)

[bridadan]

Looks ok, though I admit I don't have the full background of this change.

[0xc0170]

@studavekar Happy with the fix or not?

[0xc0170]

I restarted Travis, but might again not to report back status 😫

[studavekar]

Change fixes the problem, may be can make similar changes as other places in code where it's used.

[cmonr]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3311
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8261/

Triggering tests

/morph test
/morph export-build
/morph mbed2-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2945
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8261/

[mbed-ci]

Test : SUCCESS

Build number : 3118
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8261/3118