Decided to step back in turn this into a warning.

`luarocks list` on an empty ~/.luarocks is a valid use case.

3 files changed, 4 insertions, 4 deletions

diff --git a/src/luarocks/list.lua b/src/luarocks/list.lua
index 22dbb721..518b83ce 100644
--- a/src/luarocks/list.lua
+++ b/src/luarocks/list.lua
@@ -93,9 +93,9 @@ function list.run(...)
    
    local results = {}
    for _, tree in ipairs(trees) do
-      local ok, err, errcode = search.manifest_search(results, path.rocks_dir(tree), query)
+      local ok, err = search.manifest_search(results, path.rocks_dir(tree), query)
       if not ok then
-         return nil, err
+         util.warning(err)
       end
    end
    util.title("Installed rocks:", flags["porcelain"])
diff --git a/test/testing.lua b/test/testing.lua
index 8d8b3af2..376d6e9a 100644
--- a/test/testing.lua
+++ b/test/testing.lua
@@ -112,7 +112,7 @@ local tests = {
    fail_lint_invalid = function() return run "$luarocks lint invalid" end,
    fail_show_invalid = function() return run "$luarocks show invalid" end,
    fail_new_version_invalid = function() return run "$luarocks new_version invalid" end,
-   fail_list_invalidtree = function() return run "$luarocks --tree=/some/invalid/tree list" end,
+   test_list_invalidtree = function() return run "$luarocks --tree=/some/invalid/tree list" end,
    fail_inexistent_dir = function()
       -- Unix only?
       return run "mkdir idontexist; cd idontexist; rmdir ../idontexist; $luarocks; err=$?; cd ..; return $err"
diff --git a/test/testing.sh b/test/testing.sh
index af2ec45e..b75b51d7 100755
--- a/test/testing.sh
+++ b/test/testing.sh
@@ -367,7 +367,7 @@ fail_lint_invalid() { $luarocks lint invalid; }
 fail_show_invalid() { $luarocks show invalid; }
 fail_new_version_invalid() { $luarocks new_version invalid; }
 
-fail_list_invalidtree() { $luarocks --tree=/some/invalid/tree list; }
+test_list_invalidtree() { $luarocks --tree=/some/invalid/tree list; }
 
 fail_inexistent_dir() { mkdir idontexist; cd idontexist; rmdir ../idontexist; $luarocks; err=$?; cd ..; return $err; }