Partial fix for bug 2319: OPAC Shelf Browse results in a 404 error

This patch fixes instances where thereis no Next or Previous item on the shelf
that were previous resulting in 404 errors

diff --git a/koha-tmpl/opac-tmpl/prog/en/modules/opac-detail.tmpl b/koha-tmpl/opac-tmpl/prog/en/modules/opac-detail.tmpl
index 726f729..aabc0f7 100755 (executable)
--- a/koha-tmpl/opac-tmpl/prog/en/modules/opac-detail.tmpl
+++ b/koha-tmpl/opac-tmpl/prog/en/modules/opac-detail.tmpl
@@ -307,7 +307,7 @@
 
         
         <table><tr>
-               <td rowspan="2" style="width:20px;"><a style="height: 10em;" href="/cgi-bin/koha/opac-detail.pl?biblionumber=<!-- TMPL_VAR NAME="shelfbrowser_prev_biblionumber" -->&amp;shelfbrowse_itemnumber=<!-- TMPL_VAR NAME="shelfbrowser_prev_itemnumber" -->#shelfbrowser"><img src="/opac-tmpl/prog/images/browse-prev.gif" alt="Previous" border="0" /></a></td>
+               <td rowspan="2" style="width:20px;"><a style="height: 10em;" href="/cgi-bin/koha/opac-detail.pl?biblionumber=<!-- TMPL_IF NAME="shelfbrowser_prev_biblionumber" --><!-- TMPL_VAR NAME="shelfbrowser_prev_biblionumber" --><!-- TMPL_ELSE --><!-- TMPL_VAR NAME="biblionumber" --><!-- /TMPL_IF -->&amp;shelfbrowse_itemnumber=<!-- TMPL_VAR NAME="shelfbrowser_prev_itemnumber" -->#shelfbrowser"><img src="/opac-tmpl/prog/images/browse-prev.gif" alt="Previous" border="0" /></a></td>
 <!-- TMPL_LOOP NAME="PREVIOUS_SHELF_BROWSE" -->
         <td> <a href="/cgi-bin/koha/opac-detail.pl?biblionumber=<!-- TMPL_VAR NAME="biblionumber" -->&amp;shelfbrowse_itemnumber=<!-- TMPL_VAR NAME="itemnumber" -->#shelfbrowser">
 
@@ -331,7 +331,7 @@
 
 </a></td>
 <!-- /TMPL_LOOP -->
-<td rowspan="2" style="width:20px;"><a style="height: 10em;" href="/cgi-bin/koha/opac-detail.pl?biblionumber=<!-- TMPL_VAR NAME="shelfbrowser_next_biblionumber" -->&amp;shelfbrowse_itemnumber=<!-- TMPL_VAR NAME="shelfbrowser_next_itemnumber" -->#shelfbrowser"><img src="/opac-tmpl/prog/images/browse-next.gif" alt="Next" border="0" /></a></td>
+<td rowspan="2" style="width:20px;"><a style="height: 10em;" href="/cgi-bin/koha/opac-detail.pl?biblionumber=<!-- TMPL_IF NAME="shelfbrowser_next_biblionumber" --><!-- TMPL_VAR NAME="shelfbrowser_next_biblionumber" --><!-- TMPL_ELSE --><!-- TMPL_VAR NAME="biblionumber" --><!-- /TMPL_IF -->&amp;shelfbrowse_itemnumber=<!-- TMPL_VAR NAME="shelfbrowser_next_itemnumber" -->#shelfbrowser"><img src="/opac-tmpl/prog/images/browse-next.gif" alt="Next" border="0" /></a></td>
 </tr>
 
 <tr>