Merge pull request #3171 from jxltom/fix-uninstall-emtpy-virtualenv

Do not show error for pipenv uninstall --all in a fresh virtuanlenv

news/3170.feature

@@ -0,0 +1 @@
+Do not show error but success for running pipenv uninstall --all in a fresh virtuanlenv

pipenv/core.py

@@ -1135,10 +1135,18 @@ 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)))
         )
+
     command = "{0} uninstall {1} -y".format(
         escape_grouped_arguments(which_pip(allow_global=allow_global)),
         " ".join(to_remove),