Fix bug in upload HTML checker.

If a chunk was passed into the check_html function - e.g. it was read from a compressed file - it would search through each character in the string for certain HTML content instead of each line in the string.

lib/galaxy/util/checkers.py

@@ -14,6 +14,8 @@ HTML_CHECK_LINES = 100
 def check_html( file_path, chunk=None ):
     if chunk is None:
         temp = open( file_path, "U" )
+    elif hasattr(chunk, "splitlines"):
+        temp = chunk.splitlines()
     else:
         temp = chunk
     regexp1 = re.compile( "<A\s+[^>]*HREF[^>]+>", re.I )