Fix for sniffing tool xml files when they have less than 10 lines.

galaxy/tools/loader_directory.py

@@ -16,7 +16,10 @@ def load_tool_elements_from_path(path):
 def __looks_like_a_tool(path):
     with open(path) as f:
         for i in range(10):
-            line = f.next()
+            try:
+                line = f.next()
+            except StopIteration:
+                break
             if "<tool" in line:
                 return True
     return False