fix empty

Change-Id: Ib15a230d67a9af048106d82ed30fec64803a97ef

sc/source/filter/inc/xichart.hxx

@@ -414,7 +414,7 @@ public:
     /** Returns true, if the source link contains explicit string data. */
     inline bool         HasString() const { return mxString && !mxString->IsEmpty(); }
     /** Returns explicit string data or an empty string. */
-    OUString            GetString() const { return mxString ? mxString->GetText() : OUString(); }
+    OUString            GetString() const { if (mxString) return mxString->GetText(); return OUString(); }
     /** Returns the number of data points of this source link. */
     sal_uInt16          GetCellCount() const;