Incorrect BaseURL Formatting When Collection is Not Set AzureDevops

### Description
When a collection is not specified in the settings for Azure DevOps, the BaseURL is incorrectly formatted with an extra slash. This issue occurs in the construction of the BaseURL, leading to an invalid URL format.

### Steps to Reproduce
- Set Azure DevOps settings without specifying a collection.
- Construct the BaseURL using the provided settings.
- Observe the generated URL.

### Expected Behavior
The BaseURL should be formatted correctly without an extra slash when the collection is not set. For example, if the project name is projectName, the expected URL should be:

`https://dev.azure.com/projectName`

### Actual Behavior
The BaseURL is currently including an unnecessary slash when the collection is not set, resulting in a URL like:

`https://dev.azure.com//projectName`

Locate the Azure DevOps settings handling and the code that constructs the BaseURL. Reproduce the case with no collection specified, then verify that the resulting URL is https://dev.azure.com/projectName rather than including a double slash.

Written by the indexing model from the issue text.