Invalid API endpoint causes the API endpoint to be reset

[adi-g15-ibm]

By default, ibmcloud API endpoint is set to https://cloud.ibm.com.

But when someone passed an invalid/wrong endpoint and it fails to set the endpoint, still it resets the endpoint.

Current Behaviour:

After an invalid usage of 'ibmcloud api INVALID_ENDPOINT', endpoint is reset, and you again have to set the endpoint to https://cloud.ibm.com, using ibmcloud api https://cloud.ibm.com

This might be intentional, but I felt it should not reset the API if usage failed, and just retained the last context/endpoint

➜  ~ ibmcloud api               
API endpoint: https://cloud.ibm.com
➜  ~ ibmcloud api watsonx
Setting api endpoint...
FAILED
Could not determine the API endpoint

# Endpoint has been reset
➜  ~ ibmcloud api        
No api endpoint set. Use 'ibmcloud api' to set an endpoint
Default api endpoint: https://cloud.ibm.com

# Need to set the endpoint manually to the default
➜  ~ ibmcloud api https://cloud.ibm.com       
Setting api endpoint...
OK

API endpoint: https://cloud.ibm.com
Not logged in. Use 'ibmcloud login' to log in.
➜  ~ ibmcloud api                      
API endpoint: https://cloud.ibm.com

Expected Behaviour

➜  ~ ibmcloud api               
API endpoint: https://cloud.ibm.com
➜  ~ ibmcloud api watsonx
Setting api endpoint...
FAILED
Could not determine the API endpoint

# Maybe better to not change anything, since the last command failed
➜  ~ ibmcloud api               
API endpoint: https://cloud.ibm.com