Adding checks to see can a step to be skipped

src/main/java/org/leolo/map/osm/extract/ExtractElement.java

@@ -162,18 +162,22 @@ public class ExtractElement {
      * @param af The file which defines the action to be performed
      */
     private void doSearch(File dbFile, ActionFile af) {
+        //Placeholder
     }
 
     private void processNode(File dbFile) {
-
+        if(pendingNodes.isEmpty())
+            return;
     }
 
     private void processWay(File dbFile) {
-
+        if(pendingWays.isEmpty())
+            return;
     }
 
     private void expandRelations(File dbFile) {
-
+        if(pendingRelations.isEmpty())
+            return;
     }
 
     private void printHelp(int returnValue){