Fix a bug where type comparison is case-sensitive for TIF

TIF/TIFF is both rendered and exported by the PDF renderer and exporter.
However, the renderer only allows .tif and .tiff to be exported but
accidentally leaves .TIF, .TIFF behind. They end up being rendered
directly as PDF which fails.

Author: cslzchen

mfr/extensions/pdf/render.py

@@ -21,7 +21,7 @@ class PdfRenderer(extension.BaseRenderer):
     def render(self):
         download_url = munge_url_for_localdev(self.metadata.download_url)
         logger.debug('extension::{}  supported-list::{}'.format(self.metadata.ext, settings.EXPORT_SUPPORTED))
-        if self.metadata.ext not in settings.EXPORT_SUPPORTED:
+        if self.metadata.ext.lower() not in settings.EXPORT_SUPPORTED:
             logger.debug('Extension not found in supported list!')
             return self.TEMPLATE.render(
                 base=self.assets_url,