v0.6.3 Breadcrumb bug fix

Fixed the occurrence of unexpected attributes when chaining breadcrumb with not less than 3 elements.

print(a.a / a.b / a.c)
--> <a 1="table: XXX"><b 1="table: XXX"><c></c></b></a>

Now:

print(a.a / a.b / a.c)
--> <a><b><c></c></b></a>