Change title result page and add extra white space check on input files

tapir.cgi

@@ -39,8 +39,8 @@ else { # actually compute!
     die 500, "FIELD target sequence is empty  \n" if ! $cgi->param('target_file')   && ! $cgi->param('target');
     die 500, "FIELD microRNA sequence is empty\n" if ! $cgi->param('microrna_file') && ! $cgi->param('microrna');
 
-    die 500, "file name of target sequence should not contain whitespace" if $cgi->param('target_file') =~ m/[\s\+]/;
-    die 500, "file name of microRNA sequence should not contain whitespace" if $cgi->param('microrna_file') =~ m/[\s\+]/;
+    die 500, "file name of target sequence should not contain whitespace" if $cgi->param('target_file')  && $cgi->param('target_file') =~ m/[\s\+]/;
+    die 500, "file name of microRNA sequence should not contain whitespace" if $cgi->param('microrna_file') && $cgi->param('microrna_file') =~ m/[\s\+]/;
 
     # write down microRNA into file
     my $microrna = $cgi->param('microrna');
@@ -176,7 +176,7 @@ sub get_file {
 
 sub get_header {
     my $header = get_file('/www/group/biocomp/extra/cgi-bin/biocomp/layout_header.thtml');
-    $header =~ s/<\?\= \$title_for_layout; \?>/TAPIR/g;
+    $header =~ s/<\?php echo \$title_for_layout \?>/TAPIR Results/g;
     return $header;
 }