Work around non-scalarized connector lookup issue (#9960)

- If the lookup in ConnectEquations.lookupVarAttr fails, try again
  without subscripts in case lookup table only contains the
  non-scalarized variable.

Author: perost

OMCompiler/Compiler/NFFrontEnd/NFConnectEquations.mo

@@ -1022,6 +1022,10 @@ protected
 algorithm
   ovar := UnorderedMap.get(varName, variables);
 
+  if isNone(ovar) then
+    ovar := UnorderedMap.get(ComponentRef.stripSubscriptsAll(varName), variables);
+  end if;
+
   if isNone(ovar) then
     Error.addInternalError(getInstanceName() + " could not find the variable " +
       ComponentRef.toString(varName) + "\n", sourceInfo());