unity-azure-pipelines-tasks: Build output for 2018.3.2f1 is empty and causes build failure

When building with 2018.3.2f1 the output directory d:\_work\2\s\mstiepipelinetest\Build\Win64 is empty and causes the build to fail.

2019-01-19T20:48:39.7426247Z ==============================================================================
2019-01-19T20:48:39.7426296Z Task         : Unity Build
2019-01-19T20:48:39.7426329Z Description  : Build a Unity project and get the exported output files.
2019-01-19T20:48:39.7426362Z Version      : 2.1.0
2019-01-19T20:48:39.7426396Z Author       : Dinomite Studios
2019-01-19T20:48:39.7426439Z Help         : Builds a Unity project to supported build target platforms. [More Information](https://github.com/Dinomite-Studios/unity-azure-pipelines-tasks)
2019-01-19T20:48:39.7426485Z ==============================================================================
2019-01-19T20:48:40.0583923Z [command]D:\Unity\2018.3.2f1\Editor\Unity.exe -batchmode -buildTarget Win64 -projectPath d:\_work\2\s\mstiepipelinetest -executeMethod AzureDevOps.PerformBuild
2019-01-19T20:49:09.9312976Z debugger-agent: Unable to listen on 3024
2019-01-19T20:49:39.9333649Z Checking whether Unity process is still running...
2019-01-19T20:49:40.2907706Z Unity process has finished. Checking for build output in d:\_work\2\s\mstiepipelinetest\Build\Win64
2019-01-19T20:49:40.2947854Z ##[error]The Unity build task finished without results. Check editor logs for details.
2019-01-19T20:49:40.2969696Z ##[section]Finishing: Unity Build Win64```