fix: avoid NPE in ConfiguredController.close if manager is not set

Note that this shouldn't happen during normal execution but can happen
during tests.

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/ConfiguredController.java

@@ -221,6 +221,8 @@ private boolean failOnMissingCurrentNS() {
 
   @Override
   public void close() throws IOException {
-    manager.close();
+    if (manager != null) {
+      manager.close();
+    }
   }
 }

operator-framework-core/src/test/java/io/javaoperatorsdk/operator/processing/event/internal/CustomResourceEventSourceTest.java

@@ -118,6 +118,7 @@ private static class TestConfiguration implements
 
     final ConfigurationService service = mock(ConfigurationService.class);
     final boolean generationAware;
+
     public TestConfiguration(boolean generationAware) {
       when(service.getObjectMapper()).thenReturn(ConfigurationService.OBJECT_MAPPER);
       this.generationAware = generationAware;