fdo#71450 fdo#71698: ODF import: fix frame name corner cases

Trying to set a name that is already in use will throw an exception (and
set a different, generated name); if there is actually no name in the
file then there's no point trying to set anything.

(regression from b69d152c)

Change-Id: Ie54d4a830cc23e2853a6efeb81f77dcc788192ea

xmloff/source/text/XMLTextFrameContext.cxx

@@ -1307,12 +1307,20 @@ void XMLTextFrameContext_Impl::SetHyperlink( const OUString& rHRef,
 void XMLTextFrameContext_Impl::SetName()
 {
     Reference<XNamed> xNamed(xPropSet, UNO_QUERY);
-    if (xNamed.is())
+    if (!m_sOrigName.isEmpty() && xNamed.is())
     {
         OUString const name(xNamed->getName());
         if (name != m_sOrigName)
         {
-            xNamed->setName(m_sOrigName);
+            try
+            {
+                xNamed->setName(m_sOrigName);
+            }
+            catch (uno::Exception const& e)
+            {   // fdo#71698 document contains 2 frames with same draw:name
+                SAL_INFO("xmloff.text", "SetName(): exception setting \""
+                        << m_sOrigName << "\": " << e.Message);
+            }
         }
     }
 }