Maven site fails to run due to non-report goals

An user just reported me a curious bug when using flexmojos and maven 3....

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.0-beta-2:site (default-cli) on project calculator-api: failed to get Reports: The parameters 'filesToTrust' for goal org.sonatype.flexmojos:flexmojos-maven-plugin:4.0-SNAPSHOT:trust are missing or invalid -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.0-beta-2:site (default-cli) on project calculator-api: failed to get Reports
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:88)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:80)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:87)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:315)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:152)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:445)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:168)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:132)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: failed to get Reports
at org.apache.maven.plugins.site.DefaultMavenReportExecutor.buildMavenReports(DefaultMavenReportExecutor.java:264)
at org.apache.maven.plugins.site.AbstractSiteRenderingMojo.getReports(AbstractSiteRenderingMojo.java:208)
at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:105)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:107)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
... 19 more
Caused by: org.apache.maven.plugin.PluginParameterException: The parameters 'filesToTrust' for goal org.sonatype.flexmojos:flexmojos-maven-plugin:4.0-SNAPSHOT:trust are missing or invalid
at org.apache.maven.plugin.internal.DefaultMavenPluginManager.populatePluginFields(DefaultMavenPluginManager.java:514)
at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getConfiguredMojo(DefaultMavenPluginManager.java:467)
at org.apache.maven.plugins.site.DefaultMavenReportExecutor.getConfiguredMavenReport(DefaultMavenReportExecutor.java:294)
at org.apache.maven.plugins.site.DefaultMavenReportExecutor.buildMavenReports(DefaultMavenReportExecutor.java:234)
... 23 more

This goal 'trust' is NOT a Maven report and this user never invokes it, but seems maven-site creeps out with this goal, seems maven is trying to configure it and fail because 'filesToTrust' is required but not configured.

Since the goal is neither used nor a maven-report it shouldn't affect maven-site at all.

I will create an IT for this in a few minutes