enter_bug: Fix hard BMO dependency (#29)

The default_platform and default_op_sys Bugzilla::Product methods are
installed by the BMO extension, so don't attempt to invoke them when
it isn't present.

Author: CyberShadow

enter_bug.cgi

@@ -37,6 +37,8 @@ use Bugzilla::Field;
 use Bugzilla::Status;
 use Bugzilla::UserAgent;
 
+use List::Util qw(any);
+
 my $user = Bugzilla->login(LOGIN_REQUIRED);
 
 my $cloned_bug;
@@ -322,10 +324,15 @@ else {
     = formvalue('bug_severity', Bugzilla->params->{'defaultseverity'});
 
   # BMO - use per-product default hw/os
-  $default{'rep_platform'}
-    = formvalue('rep_platform', $product->default_platform // detect_platform());
-  $default{'op_sys'}
-    = formvalue('op_sys', $product->default_op_sys // detect_op_sys());
+  if (any { $_->NAME eq 'BMO' } @{ Bugzilla->extensions }) {
+    $default{'rep_platform'}
+      = formvalue('rep_platform', $product->default_platform // detect_platform());
+    $default{'op_sys'}
+      = formvalue('op_sys', $product->default_op_sys // detect_op_sys());
+  } else {
+      $default{'rep_platform'} = formvalue('rep_platform', detect_platform());
+      $default{'op_sys'}       = formvalue('op_sys', detect_op_sys());
+  }
   $vars->{'rep_platform'} = detect_platform();
   $vars->{'rep_op_sys'}   = detect_op_sys();