add immutable Map#of

Author: palukku

jablib/src/main/java/org/jabref/logic/integrity/IntegrityCheckResultErrorFormatWriter.java

@@ -3,7 +3,6 @@
 import java.io.IOException;
 import java.io.Writer;
 import java.nio.file.Path;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -25,7 +24,7 @@ public IntegrityCheckResultErrorFormatWriter(Writer writer, List<IntegrityMessag
     @Override
     public void writeFindings() throws IOException {
         for (IntegrityMessage message : messages) {
-            Map<Field, ParserResult.Range> fieldRangeMap = parserResult.getFieldRanges().getOrDefault(message.entry(), new HashMap<>());
+            Map<Field, ParserResult.Range> fieldRangeMap = parserResult.getFieldRanges().getOrDefault(message.entry(), Map.of());
             ParserResult.Range fieldRange = fieldRangeMap.getOrDefault(message.field(), fieldRangeMap.getOrDefault(InternalField.KEY_FIELD, parserResult.getArticleRanges().getOrDefault(message.entry(), ParserResult.Range.NULL_RANGE)));
 
             writer.write("%s:%d:%d: %s\n".formatted(