[mseaton]

Summary

• setupEncDupsValidation() in mastercard.js calls flowsheet.getFlowsheet(formName) and immediately dereferences the result's encounterTypeUuid, without checking for undefined.
• The flowsheet header form is never registered via flowsheet.addFlowsheet() (only the repeatable visit forms are), so getFlowsheet() returns undefined when called for the header form. Since setupForm() in htmlformentryui's flowsheet.js invokes the afterSetupForm extension hook (which calls setupEncDupsValidation) for the header form too, entering/editing the header throws Uncaught TypeError: Cannot read properties of undefined (reading 'encounterTypeUuid').
• Fix adds an early guard that skips duplicate-encounter validation when there's no registered flowsheet for the current form (i.e. the header form), since that check is only meaningful for the repeatable visit forms.
• Also bumps htmlformentryVersion to 7.3.0-SNAPSHOT to pick up the companion fix in openmrs-module-htmlformentry (HTML-894) for local verification of a related "Enter New ART Visit" bug. This should be reverted to a released version before merge once HTML-894 is released.

Test plan

• Open a patient's ART Mastercard flowsheet and enter/edit the header form — confirm no TypeError in console
• Confirm duplicate-encounter validation still works correctly when entering/editing an ART Visit (non-header) encounter

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