Do not mutate text when reference is not found [MACRO-1718] (#106)

libreoffice-core/sw/source/core/fields/reffld.cxx

@@ -523,8 +523,6 @@ void SwGetRefField::UpdateField(const SwTextField* pFieldTextAttr, SwFrame* pFra
 {
     SwDoc& rDoc = static_cast<SwGetRefFieldType*>(GetTyp())->GetDoc();
 
-    rText.clear();
-
     // finding the reference target (the number)
     sal_Int32 nNumStart = -1;
     sal_Int32 nNumEnd = -1;
@@ -535,11 +533,16 @@ void SwGetRefField::UpdateField(const SwTextField* pFieldTextAttr, SwFrame* pFra
     // not found?
     if ( !pTextNd )
     {
-        rText = SwViewShell::GetShellRes()->aGetRefField_RefItemNotFound;
+        // https://www.notion.so/macrocom/NoReferenceError-in-Document-text-for-invalid-references-03bf8156aec3427a8b974d2545e63041
+        // LibreOffice would update the referenced text to "Error: Reference source not found"
+        // when the source is, well, not found, e.g source got deleted
+        // rText = SwViewShell::GetShellRes()->aGetRefField_RefItemNotFound;
 
         return;
     }
 
+    rText.clear();
+
     // where is the category name (e.g. "Illustration")?
     const OUString aText = pTextNd->GetText();
     const sal_Int32 nCatStart = aText.indexOf(m_sSetRefName);