fix: uninitialized value

[dipietroR]

When clicking on the Advanced Search button, two warnings would appear:

[Fri Jul  1 16:34:41 2022] -e: Use of uninitialized value $title in substitution (s///) at /opt/product-opener/lib/ProductOpener/Display.pm line 6825.
[Fri Jul  1 16:34:41 2022] -e: Use of uninitialized value $title in substitution (s///) at /opt/product-opener/lib/ProductOpener/Display.pm line 6827.

This was because $title was empty, so I put the lines that were causing the error:

$title =~ s/<SITE>/$site/g;
$title =~ s/<([^>]*)>//g;

In the conditional below them:

if (defined $title) {

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[stephanegigandet]

Looks good, thank you!