tdf#132563 - Convert parameters of type SbxEMPTY

During the construction of the parameter list of a method,
convert parameters of type SbxEMPTY to their requested type,
since missing parameters are handled differently in StepEMPTY,
where separate parameter information (SbxMISSING) is added.

Change-Id: Ie1e027cfdd652404ec29bd3d05e7daf533468936
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/96088
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins

basic/qa/basic_coverage/test_empty_parameter.vb

@@ -0,0 +1,22 @@
+'
+' This file is part of the LibreOffice project.
+'
+' This Source Code Form is subject to the terms of the Mozilla Public
+' License, v. 2.0. If a copy of the MPL was not distributed with this
+' file, You can obtain one at http://mozilla.org/MPL/2.0/.
+'
+
+Sub assignVar(v As Variant)
+    v = 1
+End Sub
+
+Function doUnitTest() As Integer
+    ' tdf#132563 - check if empty parameters are converted to their respective types
+    anEmptyVar = Empty
+    assignVar(anEmptyVar)
+    If (anEmptyVar = 1 And TypeName(anEmptyVar) = "Integer") Then
+        doUnitTest = 1
+    Else
+        doUnitTest = 0
+    End If
+End Function

basic/source/runtime/runtime.cxx

@@ -686,7 +686,7 @@ void SbiRuntime::SetParameters( SbxArray* pParams )
             {
                 bByVal |= ( p->eType & SbxBYREF ) == 0;
                 // tdf#79426, tdf#125180 - don't convert missing arguments to the requested parameter type
-                if ( t != SbxEMPTY && !IsMissing( v, 1 ) )
+                if ( !IsMissing( v, 1 ) )
                 {
                     t = static_cast<SbxDataType>( p->eType & 0x0FFF );
                 }