Add explicit message if there is nothing to be removed during uninstall

pipenv/core.py

@@ -1154,16 +1154,17 @@ def do_purge(bare=False, downloads=False, allow_global=False):
     # Remove setuptools, pip, etc from targets for removal
     to_remove = installed - bad_pkgs
 
+    # Skip purging if there is no packages which needs to be removed
+    if not to_remove:
+        if not bare:
+            click.echo("Found 0 installed package, skip purging.")
+            click.echo(crayons.green("Environment now purged and fresh!"))
+        return installed
+
     if not bare:
         click.echo(
             fix_utf8("Found {0} installed package(s), purging…".format(len(to_remove)))
         )
-    
-    # Skip purging if there is no packages which needs to be removed
-    if not to_remove:
-        if not bare:
-            click.echo(crayons.green("Environment now purged and fresh!"))
-        return installed
 
     command = "{0} uninstall {1} -y".format(
         escape_grouped_arguments(which_pip(allow_global=allow_global)),