fdo#43460 startmath,codemaker: use isEmpty()

Change-Id: I55d3f4546f40a321ebf4b08db33536592f451944
Reviewed-on: https://gerrit.libreoffice.org/4318Reviewed-by: Marcos Souza <marcos.souza.org@gmail.com>
Reviewed-by: Noel Power <noel.power@suse.com>
Tested-by: Noel Power <noel.power@suse.com>

codemaker/source/codemaker/global.cxx

@@ -135,7 +135,7 @@ OString createFileNameFromType( const OString& destination,
         if( nIndex == -1 )
             break;
 
-        if (buffer.getLength() == 0 || OString(".") == buffer.getStr())
+        if (buffer.isEmpty() || OString(".") == buffer.getStr())
         {
             buffer.append(token);
             continue;

starmath/inc/visitors.hxx

@@ -477,7 +477,7 @@ private:
     }
     /** Append a blank for separation, if needed */
     inline void Separate( ){
-        if( !aCmdText.getLength() || aCmdText[ aCmdText.getLength() - 1 ] != ' ' )
+        if( aCmdText.isEmpty() || aCmdText[ aCmdText.getLength() - 1 ] != ' ' )
             aCmdText.append(' ');
     }
     /** Output text generated from the pNodes */