Fix unnecessary configuration node

[kazuhitoyokoi]

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

When swagger definition doesn't have host name and security setting, generated node has unnecessary configuration node (users need to input only name of configuration node). To solve the problem, I added handling to remove configuration node in the case.

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality

[coveralls]

Coverage increased (+0.2%) to 77.812% when pulling 74428c0 on kazuhitoyokoi:master-updateswaggertemplate into a71a7b9 on node-red:master.

[coveralls]

Coverage increased (+0.2%) to 77.812% when pulling 74428c0 on kazuhitoyokoi:master-updateswaggertemplate into a71a7b9 on node-red:master.

[coveralls]

Coverage increased (+0.2%) to 77.812% when pulling 74428c0 on kazuhitoyokoi:master-updateswaggertemplate into a71a7b9 on node-red:master.