Make etherpad::API optional

vroom.pl

@@ -16,7 +16,6 @@ use Digest::HMAC_SHA1 qw(hmac_sha1);
 use MIME::Base64;
 use File::stat;
 use File::Basename;
-use Etherpad::API;
 use Session::Token;
 use Email::Valid;
 use Protocol::SocketIO::Handshake;
@@ -42,7 +41,10 @@ foreach my $dir (qw/assets/){
 
 # Create etherpad api client if enabled
 our $ec = undef;
+my $etherpad = eval { require Etherpad::API };
 if ($config->{'etherpad.uri'} =~ m/https?:\/\/.*/ && $config->{'etherpad.api_key'} ne ''){
+  if ($etherpad){
+    import Etherpad::API;
     $ec = Etherpad::API->new({
       url => $config->{'etherpad.uri'},
       apikey => $config->{'etherpad.api_key'}
@@ -51,6 +53,10 @@ if ($config->{'etherpad.uri'} =~ m/https?:\/\/.*/ && $config->{'etherpad.api_key
       app->log->info("Can't connect to Etherpad-Lite API, check your API key and uri");
       $ec = undef;
     }
+  }
+  else{
+    app->log->info("Etherpad::API not found, disabling Etherpad-Lite support");
+  }
 }
 
 # Global error check