Add SAL_WARN in writerfilter graphic import

Change-Id: Iac6265094572c57f421b0533db2c90a41b2ef427
Reviewed-on: https://gerrit.libreoffice.org/48492Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

writerfilter/source/dmapper/GraphicHelpers.cxx

@@ -83,6 +83,8 @@ void PositionHandler::lcl_attribute( Id aName, Value& rVal )
                         break;
 
                     // TODO There are some other unhandled values
+                    default:
+                        SAL_WARN("writerfilter", "unhandled case (" << nIntValue << ") in NS_ooxml::LN_CT_PosV_relativeFrom");
                 }
             }
             break;
@@ -116,6 +118,8 @@ void PositionHandler::lcl_attribute( Id aName, Value& rVal )
                         break;
 
                     // TODO There are some other unhandled values
+                    default:
+                        SAL_WARN("writerfilter", "unhandled case (" << nIntValue << ") in NS_ooxml::LN_CT_PosH_relativeFrom");
                 }
             }
             break;