Correction script SQL

SQL/001_tables.sql

@@ -21,7 +21,7 @@ create table unicaen_renderer_template
     document_type varchar(256) not null,
     document_sujet text not null,
     document_corps text not null,
-    document_css text not null
+    document_css text
 );
 create unique index unicaen_document_template_code_uindex on unicaen_renderer_template (code);
 create unique index unicaen_document_template_id_uindex on unicaen_renderer_template (id);