share widget: fixed crash when a text content is shared without `text` in data: sometimes, text content is shared via a path and not directly the `text` key. This is the case with vCards. This patch fixes share widget to handle this case.

f95d0c31d45558c7b3e2fc39398f51eb0190bdca 0.7.0a1
4233be74572a1af8eebd502c009a10641c63ca0c 0.7.0a3
5c28cf8815319abd8c963022091cf4726764a3e6 0.7.0b1
51f73d210da908c9fb292e6bd7fda42a9d2b8453 0.7.0