Improve dependencies filtering in AbstractAnalyzeMojo

For empty exclusion we cen return the same collection of artifacts

Author: slawekjaranowski

src/main/java/org/apache/maven/plugins/dependency/analyze/AbstractAnalyzeMojo.java

@@ -20,7 +20,6 @@
 
 import java.io.File;
 import java.io.StringWriter;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
@@ -558,9 +557,12 @@ private void writeScriptableOutput(Set<Artifact> artifacts) {
         }
     }
 
-    private List<Artifact> filterDependencies(Set<Artifact> artifacts, String[] excludes) {
+    private Set<Artifact> filterDependencies(Set<Artifact> artifacts, String[] excludes) {
+        if (excludes == null || excludes.length == 0) {
+            return artifacts;
+        }
         ArtifactFilter filter = new StrictPatternExcludesArtifactFilter(Arrays.asList(excludes));
-        List<Artifact> result = new ArrayList<>();
+        Set<Artifact> result = new LinkedHashSet<>();
 
         for (Iterator<Artifact> it = artifacts.iterator(); it.hasNext(); ) {
             Artifact artifact = it.next();