fdo#75971: Perhaps this will prevent the crash ?

I can't reproduce the crash, so this is just a blind fix based on Julien's
input.

Change-Id: If4d20632dc1ce0671a755dd6dd31194702a95bf3

sc/source/core/tool/interpr1.cxx

@@ -7889,7 +7889,7 @@ void ScInterpreter::ScLeft()
         if (nParamCount == 2)
         {
             double nVal = ::rtl::math::approxFloor(GetDouble());
-            if ( nVal < 0.0 || nVal > SAL_MAX_UINT16 )
+            if (rtl::math::isNan(nVal) || nVal < 0.0 || nVal > SAL_MAX_UINT16)
             {
                 PushIllegalArgument();
                 return ;