Make the null templates compatible with the last Thomas's commit.

IPython/nbconvert/templates/latex/skeleton/null.tplx

@@ -81,7 +81,7 b' consider calling super even if it is a leave block, we might insert more blocks '
                 ((*- endblock headingcell -*))
             ((*- elif cell.cell_type in ['raw'] -*))
                 ((*- block rawcell scoped -*))
-                ((* if cell.metadata.get('raw_mimetype', resources.get('raw_mimetype', '')).lower() in resources.get('raw_mimetypes', ['']) *))
+                ((* if cell.metadata.get('raw_mimetype', '').lower() in resources.get('raw_mimetypes', ['']) *))
                 ((( cell.source )))
                 ((* endif *))
                 ((*- endblock rawcell -*))

IPython/nbconvert/templates/skeleton/null.tpl

@@ -77,7 +77,7 b' consider calling super even if it is a leave block, we might insert more blocks '
                 {%- endblock headingcell -%}
             {%- elif cell.cell_type in ['raw'] -%}
                 {%- block rawcell scoped -%}
-                {% if cell.metadata.get('raw_mimetype', resources.get('raw_mimetype', '')).lower() in resources.get('raw_mimetypes', ['']) %}
+                {% if cell.metadata.get('raw_mimetype', '').lower() in resources.get('raw_mimetypes', ['']) %}
                 {{ cell.source }}
                 {% endif %}
                 {%- endblock rawcell -%}