Merge branch 'feature/property-resolver' into testerra2

Author: Mike Reiche

report-model/src/main/java/eu/tsystems/mms/tic/testframework/adapters/ContextExporter.java

@@ -63,6 +63,7 @@
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.function.Consumer;
 import java.util.function.Function;
@@ -190,7 +191,7 @@ public Stream<File.Builder> buildScreenshot(Screenshot screenshot) {
             screenshotBuilder.putMeta("sourcesRefId", sourceBuilder.getId());
             fileBuilders[1] = sourceBuilder;
         });
-        return Stream.of(fileBuilders);
+        return Stream.of(fileBuilders).filter(Objects::nonNull);
     }
 
     public File.Builder buildVideo(Video video) {