Revert "Include blank attributes in HTML output (#517)" (#541)

This reverts commit cf59b8f.

lib/arbre/html/attributes.rb

@@ -6,12 +6,13 @@ class Attributes < Hash
 
       def to_s
         flatten_hash.map do |name, value|
-          if value.nil?
-            html_escape(name)
-          else
-            "#{html_escape(name)}=\"#{html_escape(value)}\""
-          end
-        end.join ' '
+          next if value_empty?(value)
+          "#{html_escape(name)}=\"#{html_escape(value)}\""
+        end.compact.join ' '
+      end
+
+      def any?
+        super{ |k,v| !value_empty?(v) }
       end
 
       protected
@@ -28,6 +29,10 @@ def flatten_hash(hash = self, old_path = [], accumulator = {})
         accumulator
       end
 
+      def value_empty?(value)
+        value.respond_to?(:empty?) ? value.empty? : !value
+      end
+
       def html_escape(s)
         ERB::Util.html_escape(s)
       end

lib/arbre/html/tag.rb

@@ -150,7 +150,7 @@ def child_is_text?
       end
 
       def attributes_html
-        attributes.any? ? " " + attributes.to_s : nil
+        " #{attributes}" if attributes.any?
       end
 
       def set_for_attribute(record)

spec/arbre/unit/html/tag_attributes_spec.rb

@@ -18,12 +18,12 @@
         expect(tag.to_s).to eq "<tag id=\"my_id\"></tag>\n"
       end
 
-      it "should still render attributes that are empty" do
+      it "shouldn't render attributes that are empty" do
         tag.class_list # initializes an empty ClassList
         tag.set_attribute :foo, ''
         tag.set_attribute :bar, nil
 
-        expect(tag.to_s).to eq "<tag id=\"my_id\" class=\"\" foo=\"\" bar></tag>\n"
+        expect(tag.to_s).to eq "<tag id=\"my_id\"></tag>\n"
       end
 
       context "with hyphenated attributes" do
@@ -41,12 +41,12 @@
           expect(tag.to_s).to eq "<tag id=\"my_id\" data-action=\"some_action\"></tag>\n"
         end
 
-        it "should still render attributes that are empty" do
+        it "shouldn't render attributes that are empty" do
           tag.class_list # initializes an empty ClassList
           tag.set_attribute :foo, { bar: '' }
           tag.set_attribute :bar, { baz: nil }
 
-          expect(tag.to_s).to eq "<tag id=\"my_id\" data-action=\"some_action\" class=\"\" foo-bar=\"\" bar-baz></tag>\n"
+          expect(tag.to_s).to eq "<tag id=\"my_id\" data-action=\"some_action\"></tag>\n"
         end
       end