Error generating URN-catalog when blank one exists

[JamesonNetworks]

Preconditions

Install Magento from develop branch.

Steps to reproduce

1. Install Magento from develop branch.
2. Create a blank misc.xml file inside of the .idea folder (if using php storm)
3. Run 'bin/magento dev:urn-catalog:generate --ide="phpstorm" ./.idea/misc.xml'

Expected result

1. A new URN catalog for the project should get generated

Actual result

1. User receives the error "Warning: DOMDocument::loadXML(): Empty string supplied as input in /Sites/magento2ce/app/code/Magento/Developer/Model/XmlCatalog/Format/PhpStorm.php on line 61"

I admit that it is an esoteric case, however, the routine generating the xml file is only creating a new fresh file in the instance that the file doesn't exist. If a blank file exists, it attempts to read the existing XML out of the file and throws the error. I had a problem where I created the .idea/misc.xml file but an exception was thrown during the creation process. The invalid misc.xml would generate this error until I removed the file entirely and ran the command again. Pretty low priority, but just thought I'd report it.

[magento-engcom-team]

@JamesonNetworks, thank you for your report.
We've created internal ticket(s) MAGETWO-80579 to track progress on the issue.