fdo#64761: sw: avoid another ~SwIndexReg assert

SwXText::convertToTextFrame(): This one is rather spurious since the
local variables aren't used later anyway, so just park them  somewhere safe.

Change-Id: I47d3092fbf22a228fa3f440602c0affa43fbb6d7

sw/source/core/unocore/unotext.cxx

@@ -1656,6 +1656,8 @@ throw (lang::IllegalArgumentException, uno::RuntimeException)
             if (bParaBeforeInserted)
             {
                 SwCursor aDelete(*aStartPam.GetPoint(), 0, false);
+                *aStartPam.GetPoint() = // park it because node is deleted
+                    SwPosition(GetDoc()->GetNodes().GetEndOfContent());
                 aDelete.MovePara(fnParaCurr, fnParaStart);
                 aDelete.SetMark();
                 aDelete.MovePara(fnParaCurr, fnParaEnd);
@@ -1664,6 +1666,8 @@ throw (lang::IllegalArgumentException, uno::RuntimeException)
             if (bParaAfterInserted)
             {
                 SwCursor aDelete(*pEndPam->GetPoint(), 0, false);
+                *pEndPam->GetPoint() = // park it because node is deleted
+                    SwPosition(GetDoc()->GetNodes().GetEndOfContent());
                 aDelete.MovePara(fnParaCurr, fnParaStart);
                 aDelete.SetMark();
                 aDelete.MovePara(fnParaCurr, fnParaEnd);