Account for query of only forward slash(es).

app/models/repository.rb

@@ -938,10 +938,10 @@ class Repository
   end
   def search_files_by_name(query, ref)
-    return [] if empty? || query.blank?
-
     safe_query = query.sub(/^\/*/, "")
+    return [] if empty? || safe_query.blank?
+
     args = %W(ls-tree --full-tree -r #{ref || root_ref} --name-status | #{Regexp.escape(safe_query)})
     run_git(args).first.lines.map(&:strip)

spec/models/repository_spec.rb

@@ -670,9 +670,16 @@ describe Repository do
     it 'ignores leading slashes' do
       results = repository.search_files_by_name('/files', 'master')
+
       expect(results.first).to eq('files/html/500.html')
     end
+    it 'properly handles when query is only slashes' do
+       results = repository.search_files_by_name('//', 'master')
+
+       expect(results).to match_array([])
+    end
+
     it 'properly handles when query is not present' do
       results = repository.search_files_by_name('', 'master')