bug: datacite parser can fail when trying to access non-existent tag attributes

[seasidesparrow]

Describe the bug
The habanero content_negotiation method can return DataCite records in the kernel-4 xml format. The existing datacite parser will fail at L132 if the <title> tag does not have attributes embedded within the tag. The parser will return an IndexError exception when that happens: IndexError: list index out of range

To Reproduce

• Obtain the datacite-xml formatted record via habanero.cn.content_negotiation(ids='10.15468/t4rau8', format='datacite-xml', url='https://api.datacite.org')
• Parse the record with adsingestp.parsers.datacite.parse(xmldata)

Additional context
Add any other context about the problem here.