Output format: do not print empty lines
Some of the commands print empty lines.

```
$ dvc pull # Nothing to pull
# This is an empty line
```

```
$ dvc status # Nothing to show
# This is an empty line
```

Probably we have more commands with the same issue.
diff --git a/dvc/progress.py b/dvc/progress.py
index 64ea7ed95..a40ba83f8 100644
--- a/dvc/progress.py
+++ b/dvc/progress.py
@@ -47,10 +47,6 @@ class Progress(object):
 
             self._n_finished += 1
 
-    def finish(self):
-        if sys.stdout.isatty():
-            print()
-
     def _bar(self, target_name, current, total):
         """
         Make a progress bar out of info, which looks like:
diff --git a/dvc/utils.py b/dvc/utils.py
index d0c707a14..7995c856b 100644
--- a/dvc/utils.py
+++ b/dvc/utils.py
@@ -129,7 +129,5 @@ def map_progress(func, targets, n_threads):
         ret = pool.map(wrapper, targets)
     except Exception as exc:
         raise
-    finally:
-        progress.finish()
 
     return list(zip(targets, ret))
['dvc/utils.py', 'dvc/progress.py']