find, uninstall: improved user interaction in the case of empty DB (#2278)

lib/spack/spack/cmd/find.py

@@ -115,7 +115,7 @@ def find(parser, args):
     q_args = query_arguments(args)
     query_specs = args.specs(**q_args)
     # Exit early if no package matches the constraint
-    if not query_specs:
+    if not query_specs and args.constraint:
         msg = "No package matches the query: {0}".format(args.contraint)
         tty.msg(msg)
         return

lib/spack/spack/cmd/uninstall.py

@@ -101,7 +101,7 @@ def concretize_specs(specs, allow_multiple_matches=False, force=False):
             has_errors = True
 
         # No installed package matches the query
-        if len(matching) == 0:
+        if len(matching) == 0 and spec is not any:
             tty.error("%s does not match any installed packages." % spec)
             has_errors = True
 
@@ -196,6 +196,10 @@ def uninstall(parser, args):
 
     uninstall_list = get_uninstall_list(args)
 
+    if not uninstall_list:
+        tty.msg("There are no package to uninstall.")
+        return
+
     if not args.yes_to_all:
         tty.msg("The following packages will be uninstalled : ")
         print('')