xmlsecurity OOXML export: remove signature storage with the last signature

So that no empty _xmlsignatures directory is left around after removing
signatures.

Change-Id: I3af77ba943a483a009a4eebaf40a58404f479e5a
(cherry picked from commit e60abe659d7448ae6f839740dcfe87fd8b1520d7)

1 files changed, 4 insertions, 1 deletions

diff --git a/xmlsecurity/source/helper/documentsignaturemanager.cxx b/xmlsecurity/source/helper/documentsignaturemanager.cxx
index 8a568bd107d4..505554e89e1f 100644
--- a/xmlsecurity/source/helper/documentsignaturemanager.cxx
+++ b/xmlsecurity/source/helper/documentsignaturemanager.cxx
@@ -383,6 +383,9 @@ void DocumentSignatureManager::write()
         {
             // Removing all signatures: then need to remove the signature relation as well.
             maSignatureHelper.EnsureSignaturesRelation(mxStore, /*bAdd=*/false);
+            // Also remove the whole signature sub-storage: release our read-write reference + remove the element.
+            aStreamHelper = SignatureStreamHelper();
+            mxStore->removeElement("_xmlsignatures");
         }
 
         for (size_t i = 0; i < nSignatureCount; ++i)
@@ -390,7 +393,7 @@ void DocumentSignatureManager::write()
     }
 
     // If stream was not provided, we are responsible for committing it....
-    if (!mxSignatureStream.is())
+    if (!mxSignatureStream.is() && aStreamHelper.xSignatureStorage.is())
     {
         uno::Reference<embed::XTransactedObject> xTrans(aStreamHelper.xSignatureStorage, uno::UNO_QUERY);
         xTrans->commit();