Hide analyze button if corpus is not ready for this

app/corpora/cqi/models/corpora.py

@@ -61,6 +61,9 @@ class Corpus(Model):
                         subattr_value
         return lookups
 
+    def drop(self):
+        return self.client.api.corpus_drop_corpus(self.attrs['api_name'])
+
     def query(self, query, subcorpus_name='Results'):
         return self.client.api.cqp_query(self.attrs['api_name'],
                                          subcorpus_name, query)