Missing docker tag results in un-actionable error message

[martinda]

When the docker tag is not provided, the application is unable to produce a WAR file and reports: "This is something wrong with your configuration file. Please fix and try again"

In the console, the error is more descriptive:

2020-08-22 12:05:37.809  INFO 7194 --- [nio-8080-exec-7] i.j.t.w.lib.util.DockerfileBuilder       : Building Docker image 
invalid argument "" for "-t, --tag" flag: invalid reference format
See 'docker build --help'.
2020-08-22 12:05:38.118 ERROR 7194 --- [nio-8080-exec-7] c.o.j.c.j.d.service.PackagerController   : java.io.IOException: Command failed with exit code 125: docker build -t  .

However, when the service is hosted, users do not have access to the console messages. Users will not know what is wrong. The error needs to be raised all the way to the user interface. This error can be prevented by forcing the user to enter a valid docker tag name in the package configuration pop-up, not not let the user close the pop up

[sladyn98]

Yeah we would need to attach the error message to the 404 being thrown.