# HG changeset patch
# User Brian Neal <bgneal@gmail.com>
# Date 1445799296 18000
# Node ID 9b197dbba34bc99e9537769b5502fbed90ec7f52
# Parent  7167c489bcddef1115edd6be6d030b09cc7040ab
Fix image_check so it doesn't choke on empty input.

Issue #88.

diff -r 7167c489bcdd -r 9b197dbba34b core/html.py
--- a/core/html.py	Sun Oct 25 13:28:19 2015 -0500
+++ b/core/html.py	Sun Oct 25 13:54:56 2015 -0500
@@ -75,6 +75,10 @@
     hosts. If None, USER_IMAGES_SOURCES from settings will be used as the
     whitelist.
     """
+    html = html.strip()
+    if not html:
+        return True
+
     if not allowed_hosts:
         allowed_hosts = ALLOWED_HOSTS
 
diff -r 7167c489bcdd -r 9b197dbba34b core/tests/test_html.py
--- a/core/tests/test_html.py	Sun Oct 25 13:28:19 2015 -0500
+++ b/core/tests/test_html.py	Sun Oct 25 13:54:56 2015 -0500
@@ -66,3 +66,11 @@
         html = TEST_HTML.format(src1=url1, src2=url2)
 
         self.assertRaises(ImageCheckError, image_check, html, self.allowed_hosts)
+
+    def test_empty_string(self):
+        result = image_check('')
+        self.assertTrue(result)
+
+    def test_whitespace(self):
+        result = image_check('\r\n\r\n')
+        self.assertTrue(result)