emcee.py: minor fix

bilby/core/sampler/emcee.py

@@ -62,10 +62,10 @@ class Emcee(MCMCSampler):
             if LooseVersion(emcee.__version__) > LooseVersion('2.2.1'):
                 self.kwargs['log_prob0'] = self.kwargs.pop('lnprob0')
                 self.kwargs['store'] = self.kwargs.pop('storechain')
-            
-                if self.kwargs['mh_proposal'] is not None
-                    logger.warning("The 'mh_proposal' option is no longer "
-                                   "used in emcee v{}, and will be ignored.".format(emcee.__version__))
+
+                if self.kwargs['mh_proposal'] is not None:
+                    logger.warning("The 'mh_proposal' option is no longer used "
+                                   "in emcee v{}, and will be ignored.".format(emcee.__version__))
                 del self.kwargs['mh_proposal']
 
     def _translate_kwargs(self, kwargs):
@@ -174,4 +174,3 @@ class Emcee(MCMCSampler):
         else:
             log_likelihood = self.log_likelihood(theta)
             return log_likelihood + log_prior, [log_likelihood, log_prior]
-