Expected: The version list shows.

Received: The version list in the launcher shows a "Loading Versions" message.

To reproduce: Start the launcher.

Error Message:
Unexpected exception refreshing version list
java.lang.IllegalArgumentException: Release time cannot be null
at net.minecraft.launcher.versions.PartialVersion.<init>(PartialVersion.java:16)
at net.minecraft.launcher.versions.PartialVersion.<init>(PartialVersion.java:26)
at net.minecraft.launcher.updater.VersionList.serializeVersionList(VersionList.java:146)
at net.minecraft.launcher.updater.LocalVersionList.saveVersionList(LocalVersionList.java:65)
at net.minecraft.launcher.updater.VersionManager.refreshVersions(VersionManager.java:65)
at net.minecraft.launcher.Launcher$2.run(Launcher.java:159)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)