provision_container: Conditionally apply EasyRDF patch

This commit only applies the EasyRDF when the appropriate file exists.

distillery/resources/compose/barrel/scripts/provision_container.sh

@@ -100,7 +100,9 @@ composer install
 
 # Patch EasyRDF (for now)
 EASYRDF_RESPONSE="./vendor/easyrdf/easyrdf/lib/EasyRdf/Http/Response.php"
-patch -N "$EASYRDF_RESPONSE" < "/patch/easyrdf.patch"
+if [ -f "$EASYRDF_RESPONSE" ]; then
+    patch -N "$EASYRDF_RESPONSE" < "/patch/easyrdf.patch"
+fi
 popd
 
 drupal_sites_permission_workaround
@@ -136,4 +138,4 @@ function printdetails() {
     echo "Ontology Paths:       (empty)"
     echo "SameAs property:      http://www.w3.org/2002/07/owl#sameAs"
 }
-printdetails
+printdetails