Checks fail right after format

[drallgood]

For some reason I can run gradle licenseFormat licenseMain and it will fail with a ton of "Missing header in ..." errors

Config:

license {
    header  = project.file("header.txt")
}

[drallgood]

issue is here:

license-gradle-plugin/src/main/groovy/nl/javadude/gradle/plugins/license/maven/LicenseCheckMojo.java

Line 51 in 09eea5d

if (document.headerDetected() && skipExistingHeaders) {

if skipExistingHeaders is false (the default) it fails for that file