From 53b67f606d0531cbf43e0dc77a6964b098c8e584 Mon Sep 17 00:00:00 2001
From: Manuel Puyol <manuelpuyol@github.com>
Date: Fri, 19 Feb 2021 09:43:42 -0600
Subject: [PATCH 1/2] early return when classify value is an empty string

---
 lib/primer/classify.rb       | 2 +-
 test/primer/classify_test.rb | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/primer/classify.rb b/lib/primer/classify.rb
index 884fc1ddd2..054355d7cb 100644
--- a/lib/primer/classify.rb
+++ b/lib/primer/classify.rb
@@ -182,7 +182,7 @@ def extract_hash(styles_hash)
       end
 
       def extract_value(memo, key, val, breakpoint)
-        return if val.nil?
+        return if val.nil? || val == ""
 
         if SPACING_KEYS.include?(key)
           if MARGIN_DIRECTION_KEYS.include?(key)
diff --git a/test/primer/classify_test.rb b/test/primer/classify_test.rb
index 34961f0065..75b77e7604 100644
--- a/test/primer/classify_test.rb
+++ b/test/primer/classify_test.rb
@@ -118,6 +118,7 @@ def test_underline
   end
 
   def test_color
+    assert_generated_class(nil,                  { color: "" })
     assert_generated_class("text-blue",          { color: :blue })
     assert_generated_class("text-red",           { color: :red })
     assert_generated_class("text-gray-light",    { color: :gray_light })

From c7906b7aa555838679e296ed46d41f42fddaa9b3 Mon Sep 17 00:00:00 2001
From: Manuel Puyol <manuelpuyol@github.com>
Date: Fri, 19 Feb 2021 09:44:21 -0600
Subject: [PATCH 2/2] update changelog

---
 CHANGELOG.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5437c43ab..6e82a2d8d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## main
 
+* Fix bug when empty string was passed to Classify.
+
+    *Manuel Puyol*
+
 ## 0.0.19
 
 * Add support for functional colors to `color` system argument.