- fixed NPE if empty pythonHome includes or excludes

- empty includes should be handled like the default ".*"

Author: tomasstupka

graalpython/graalpy-archetype-polyglot-app/src/main/resources/archetype-resources/pom.xml

@@ -51,14 +51,15 @@
                 <package>termcolor==2.2</package>
               </packages>
               <pythonHome>
-                <!-- java-like regular expression what file paths should be included into venv/home;
-                     default is all -->
                 <includes>
+                  <!-- java-like regular expression what file paths should be included into venv/home;
+                       if empty than default is all -->
                   <include>.*</include>
-                </includes>
+                </includes>                
+                <excludes>
                 <!-- java-like regular expression what file paths should be excluded from venv/home;
                      default is none -->
-                <excludes>
+                  <!-- <exclude></exclude> -->
                 </excludes>
               </pythonHome>
             </configuration>

graalpython/graalpy-maven-plugin/src/main/java/org/graalvm/python/maven/plugin/ManageResourcesMojo.java

@@ -178,9 +178,23 @@ public static class PythonHome {
     private void manageHome() throws MojoExecutionException {
         var homeDirectory = getHomeDirectory(project);
         if (pythonHome == null) {
-            delete(homeDirectory);
-            return;
+            pythonHome = new PythonHome();
+            pythonHome.includes = Arrays.asList(".*");
+            pythonHome.excludes = Collections.emptyList();
+        } else {
+            if (pythonHome.includes != null) {
+                trim(pythonHome.includes);
+            }
+            if (pythonHome.includes == null || pythonHome.includes.isEmpty()) {
+                pythonHome.includes = Arrays.asList(".*");
+            }
+            if (pythonHome.excludes == null) {
+                pythonHome.excludes = Collections.emptyList();
+            } else {
+                trim(pythonHome.excludes);
+            }
         }
+
         var tag = homeDirectory.resolve("tagfile");
         var graalPyVersion = getGraalPyVersion(project);