py2: amari.xlog: Accept both str and unicode for "expected to be string" entries

json might decode them as unicode.

amari/xlog.py

@@ -676,6 +676,10 @@ def get1(xd, key, typeok):
     if key not in xd:
         raise ParseError("%s:%d/%s no `%s`" %
                             (xd.pos[0], xd.pos[1], '/'.join(xd.path), key))
+    # py2
+    if typeok == str:
+        typeok = (str, unicode)
+
     val = xd[key]
     if not isinstance(val, typeok):
         raise ParseError("%s:%d/%s : got %s  ; expected `%s`" %