unoconv also handles cache_result late

 * See previous commit. `cache_result` has the same issue as
  `file_required`.

mfr/core/extension.py

@@ -50,15 +50,15 @@ def __init__(self, metadata, file_path, url, assets_url, export_url):
             'url': self.url,
             'export_url': self.export_url,
             'file_path': self.file_path,
-            'cache_result': self.cache_result,
             # 'error': 'error_t',
             # 'elapsed': 'elpased_t',
         })
 
-        # unoconv gets file_required from its subrenderer, which is constructed at the end of
-        # __init__.
+        # unoconv gets file_required and cache_result from its subrenderer, which is constructed
+        # at the end of __init__
         try:
             self.renderer_metrics.add('file_required', self.file_required)
+            self.renderer_metrics.add('cache_result', self.cache_result)
         except AttributeError:
             pass
 

mfr/extensions/unoconv/render.py

@@ -36,6 +36,8 @@ def __init__(self, metadata, file_path, url, assets_url, export_url):
 
         # can't call file_required until renderer is built
         self.renderer_metrics.add('file_required', self.file_required)
+        self.renderer_metrics.add('cache_result', self.cache_result)
+
         self.metrics.merge({
             'map': {
                 'renderer': self.map['renderer'],