Fix for issue 8396: filter out the empty field (#8783)

Co-authored-by: tomlin <tomlin@tomlins-mbp.lan>
Co-authored-by: Christoph <siedlerkiller@gmail.com>

CHANGELOG.md

@@ -22,6 +22,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 - We fixed the unnecessary horizontal scroll bar in group panel [#8467](https://github.com/JabRef/jabref/issues/8467)
 - We fixed an issue where the notification bar message, icon and actions appeared to be invisible. [#8761](https://github.com/JabRef/jabref/issues/8761)
+- We fixed an issue where deprecated fields tab is shown when the fields don't contain any values. [#8396](https://github.com/JabRef/jabref/issues/8396)
 
 ### Removed
 

src/main/java/org/jabref/gui/entryeditor/DeprecatedFieldsTab.java

@@ -3,6 +3,7 @@
 import java.util.Collections;
 import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import javax.swing.undo.UndoManager;
 
@@ -53,7 +54,7 @@ public DeprecatedFieldsTab(BibDatabaseContext databaseContext,
     protected Set<Field> determineFieldsToShow(BibEntry entry) {
         Optional<BibEntryType> entryType = entryTypesManager.enrich(entry.getType(), databaseContext.getMode());
         if (entryType.isPresent()) {
-            return entryType.get().getDeprecatedFields();
+            return entryType.get().getDeprecatedFields().stream().filter(field -> !entry.getField(field).isEmpty()).collect(Collectors.toSet());
         } else {
             // Entry type unknown -> treat all fields as required
             return Collections.emptySet();