RED-6126: performance-test

*fixed NullPointerException

ocr-service-v1/ocr-service-server-v1/src/main/java/com/iqser/red/service/ocr/v1/server/service/InvisibleElementRemovalService.java

@@ -76,6 +76,8 @@ public class InvisibleElementRemovalService {
             Page page = iterator.next();
 
             visitedXObjIds.add(page.getSDFObj().getObjNum());
+
+
             InvisibleElementRemovalContext context = InvisibleElementRemovalContext.builder()
                     .reader(reader)
                     .clippingPathStack(new ClippingPathStack(page.getMediaBox()))
@@ -221,8 +223,14 @@ public class InvisibleElementRemovalService {
 
 
     private void processPath(Element pathElement, ElementWriter writer, InvisibleElementRemovalContext context) throws PDFNetException {
+        PathData pathData = pathElement.getPathData();
 
-        GeneralPath linePath = convertToGeneralPath(pathElement.getPathData());
+        if (pathData.getOperators().length == 0 && pathData.getPoints().length == 0) {
+            writer.writeGStateChanges(pathElement);
+            return;
+        }
+
+        GeneralPath linePath = convertToGeneralPath(pathData);
 
         //transform path to initial user space
         var ctm = pathElement.getCTM();