maven-3.0.x/src/main/java/org/sonatype/aether/util/artifact/DefaultArtifact.java [244:249]:
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        this.groupId = emptify( groupId );
        this.artifactId = emptify( artifactId );
        this.classifier = emptify( classifier );
        this.extension = emptify( extension );
        this.version = emptify( version );
        this.file = file;
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maven-3.0.x/src/main/java/org/sonatype/aether/util/artifact/DefaultArtifact.java [264:269]:
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        this.groupId = emptify( groupId );
        this.artifactId = emptify( artifactId );
        this.classifier = emptify( classifier );
        this.extension = emptify( extension );
        this.version = emptify( version );
        this.file = file;
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