Back-end can't handle formatter suffixes

[maxpatiiuk]

When formatter includes a field that does not have a field name and exists just to provide a separator, back-end fails. Example Formatter:

	<format
	  name="Agent"
	  title="Agent"
	  class="edu.ku.brc.specify.datamodel.Agent"
	  default="true"
	>
		<switch single="false" field="agentType">
			<fields value="0">
				<field>firstName</field>
			</fields>
			<fields value="1">
				<field>firstName</field>
				<field sep=":||">firstName</field>
				<field sep=" *">agentType</field>
<!-- It fails because of the following field: -->
				<field sep=" "/>
			</fields>
			<fields value="2">
				<field>lastName</field>
			</fields>
		</switch>
	</format>

Back-end should be modified to handle this case

See #3309 (comment)

Fails on line this line:

specify7/specifyweb/stored_queries/format.py

Line 112 in 8a2860a

path = fieldNode.text.split('.')