Import from HTTPS with privately signed key is not supported

When importing from an SVN with a privately signed key, I get the following message and the import fails.
Instead, it should prompt the user if he wants to allow access for the server or not.

23:15:53 svn import for: https://my_server.com/my_project\\
23:15:54 Checking out https://my_server.com/my_project...\\
23:15:55 svn: OPTIONS of 'https://my_server/my_project': Server certificate verification failed: certificate issued for a different hostname, issuer is not trusted (https://my_server.com)\\
23:15:55 Svn checkout failed: <class 'bitbucket.apps.async.tasks.ImportException'>: Command failed. Return value: 1