Item2454: restore graceful failure if unable to parse XLSX because of…

… missing prerequisites

git-svn-id: http://svn.foswiki.org/trunk/StringifierContrib@9726 0b4bb1d4-4e5a-0410-9cc4-b2b747904278

lib/Foswiki/Contrib/StringifierContrib/Plugins/XLSX.pm

@@ -20,7 +20,6 @@ __PACKAGE__->register_handler("application/vnd.openxmlformats-officedocument.spr
 
 use Text::Iconv;
 use Encode ();
-use Spreadsheet::XLSX;
 use Error qw(:try);
 
 sub stringForFile {
@@ -29,11 +28,16 @@ sub stringForFile {
     #my $converter = Text::Iconv->new("utf-8", "windows-1251");
     my $book;
 
+    try {
+	require Spreadsheet::XLSX;
+    } catch Error with {
+	return '';
+    }
+
     try {
         $book = Spreadsheet::XLSX->new($file);
     }
     catch Error with {
-
         # file not opened, possibly passworded
         return '';
     };