Style: Rework color coding of ZIP entries

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/tree/ZipEntryNode.java

@@ -13,9 +13,18 @@ public class ZipEntryNode {
 
     public Color getTextColor() {
         if (entry.getErrorType() != null) {
-            return Color.RED;
-        } else if (entry.getModel() != null && entry.getModel().isValidated()) {
+            return Color.DARKRED;
+        } else if (entry.getModel() != null) {
+            if (entry.getModel().getNumberOfFeatures() == 0) {
+                return Color.GRAY;
+            }
+            if (entry.getModel().isValidated()) {
+                if (entry.getModel().collectErrors().isEmpty()) {
                     return Color.GREEN;
+                }
+                return Color.RED;
+            }
+            return Color.BLUE;
         } else if (entry.isDecompressed()) {
             return Color.BLUE;
         } else {