Parser.Wikibase: Return null instead of empty string if invalid title passed to getEntityId [#415]

400_xowa/src/gplx/xowa/xtns/scribunto/libs/Scrib_lib_wikibase.java

@@ -142,9 +142,9 @@ public class Scrib_lib_wikibase implements Scrib_lib {
 		byte[] rv = null;
 		if (ttl != null) // must check for null; PAGE:en.w:Water_treader DATE:2018-07-01
 			rv = wiki.Appe().Wiki_mgr().Wdata_mgr().Qid_mgr.Get_qid_or_null(wiki, ttl);
-		if (rv == null)  // can be null if ttl is invalid or doesn't exist
-			rv = Bry_.Empty;
-		return rslt.Init_obj(rv);
+		return rv == null 
+			? rslt.Init_null() // null if ttl is invalid or doesn't exist; NOTE: must be null, not ""; PAGE:en.w:Nicoletella; ISSUE#:415 DATE:2019-03-31
+			: rslt.Init_obj(rv);
 	}
 	// REF: https://github.com/wikimedia/mediawiki-extensions-Wikibase/blob/master/client/config/WikibaseClient.default.php
 	private static final int ReferencedEntityIdMaxDepth = 4, ReferencedEntityIdMaxReferencedEntityVisits = 50;

400_xowa/src/gplx/xowa/xtns/scribunto/libs/wikibases/Basic__tst.java

@@ -55,8 +55,8 @@ public class Basic__tst {
 			);
 
 		fxt.Test_scrib_proc_str(lib, Scrib_lib_wikibase.Invk_getEntityId, Object_.Ary("Earth"							), "Q2");
-		fxt.Test_scrib_proc_str(lib, Scrib_lib_wikibase.Invk_getEntityId, Object_.Ary("missing_page"					), "");
-		fxt.Test_scrib_proc_str(lib, Scrib_lib_wikibase.Invk_getEntityId, Object_.Ary(""								), ""); // PAGE:en.w:Water_treader DATE:2018-07-01
+		fxt.Test_scrib_proc_str(lib, Scrib_lib_wikibase.Invk_getEntityId, Object_.Ary("missing_page"					), null);
+		fxt.Test_scrib_proc_str(lib, Scrib_lib_wikibase.Invk_getEntityId, Object_.Ary(""								), null); // PAGE:en.w:Water_treader DATE:2018-07-01
 	}
 	@Test  public void GetReferencedEntityId() {
 		wdata_fxt.Init__docs__add(wdata_fxt.Wdoc_bldr("Q1").Xto_wdoc());