Problem: Maven 3.3.2 changed a bit things

[cstamas]

That results that dependencies without versions (even if "validator" we replace passed it thru) makes the build fail:
apache/maven@618e62d#diff-a50ddacb3dedf77caed875fe97b242d3d2a222a503aaf07ca7394da7bf750a38

Here a switch was made from nullcheck to commons-lang nonblank.

Hence, io.takari.maven.targetplatform.IntegrationTest#testNonstrictMixed makes fail with:

.[1;31mjava.lang.IllegalArgumentException.[m: .[1;31mversion can neither be null, empty nor blank.[m
    .[1mat.[m org.apache.commons.lang3.Validate.notBlank (.[1mValidate.java:454.[m)
    .[1mat.[m org.apache.maven.artifact.ArtifactUtils.notBlank (.[1mArtifactUtils.java:107.[m)
    .[1mat.[m org.apache.maven.artifact.ArtifactUtils.key (.[1mArtifactUtils.java:97.[m)
    .[1mat.[m org.apache.maven.ReactorReader.findArtifact (.[1mReactorReader.java:101.[m)
    .[1mat.[m org.eclipse.aether.util.repository.ChainedWorkspaceReader.findArtifact (.[1mChainedWorkspaceReader.java:97.[m)
    .[1mat.[m org.apache.maven.internal.aether.MavenChainedWorkspaceReader.findArtifact (.[1mMavenChainedWorkspaceReader.java:81.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve (.[1mDefaultArtifactResolver.java:306.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts (.[1mDefaultArtifactResolver.java:229.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact (.[1mDefaultArtifactResolver.java:207.[m)
    .[1mat.[m io.takari.maven.targetplatform.FilteredArtifactResolver.resolveArtifact (.[1mFilteredArtifactResolver.java:57.[m)
    .[1mat.[m org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom (.[1mDefaultArtifactDescriptorReader.java:240.[m)
    .[1mat.[m org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor (.[1mDefaultArtifactDescriptorReader.java:171.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.resolveCachedArtifactDescriptor (.[1mDefaultDependencyCollector.java:538.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.getArtifactDescriptorResult (.[1mDefaultDependencyCollector.java:523.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (.[1mDefaultDependencyCollector.java:410.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (.[1mDefaultDependencyCollector.java:362.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.process (.[1mDefaultDependencyCollector.java:349.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.doRecurse (.[1mDefaultDependencyCollector.java:506.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (.[1mDefaultDependencyCollector.java:458.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (.[1mDefaultDependencyCollector.java:362.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.process (.[1mDefaultDependencyCollector.java:349.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.collectDependencies (.[1mDefaultDependencyCollector.java:254.[m)
    .[1mat.[m org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies (.[1mDefaultRepositorySystem.java:284.[m)
    .[1mat.[m org.apache.maven.project.DefaultProjectDependenciesResolver.resolve (.[1mDefaultProjectDependenciesResolver.java:170.[m)
    .[1mat.[m org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies (.[1mLifecycleDependencyResolver.java:266.[m)