[Fix #1078] Fix a crasher in HtmlToStringHelper

app/helpers/html_to_string_helper.rb

@@ -1,10 +1,14 @@
 module HtmlToStringHelper
   def html_to_string(html)
-    string_with_tags = html
-      .gsub(/<br[ ]?[\/]?>/, "\n")
-      .gsub('</p>', "\n")
-      .gsub('<p>', '')
+    if html.blank?
+      html
+    else
+      string_with_tags = html
+        .gsub(/<br[ ]?[\/]?>/, "\n")
+        .gsub('</p>', "\n")
+        .gsub('<p>', '')
 
-    strip_tags(string_with_tags)
+      strip_tags(string_with_tags)
+    end
   end
 end

spec/helpers/html_to_string_helper_spec.rb

@@ -4,6 +4,11 @@ describe HtmlToStringHelper do
       it { expect(helper.html_to_string('text')).to eq('text') }
     end
 
+    describe 'deals with empty / nil strings' do
+      it { expect(helper.html_to_string(nil)).to eq(nil) }
+      it { expect(helper.html_to_string('')).to eq("") }
+    end
+
     describe 'deals with <br>' do
       it { expect(helper.html_to_string('new<br>line')).to eq("new\nline") }
       it { expect(helper.html_to_string('new<br/>line')).to eq("new\nline") }