Function updateMetaData

updateMetaData(contextId, data): Promise<void>
JMap.MapContext.updateMetaData

Updates a map context meta-data (= data that describe the context), without changing the map data.

The map context map's data will not be changed, for that use JMap.MapContext.update function.

The map-context meta-data is persisted server-side.

You can provide partial meta-data, if a meta-data is not provided it will not be changed.
Parameters
- contextId: JId
  the JMap map context id
- data: JMapContextMetaData
  partial map context meta-data, only data provided will be updated
Returns Promise<void>
the updated map context
Throws
if context not found, or empty or invalid meta-data, or server request error

Example
```
// update the map-context id=3 meta-data
JMap.MapContext
   .updateMetaData(3, { // only "title" and "description" meta-data will be changed, "shareLink" keep the same
     title: "My new title",
     descritpion: "My new description"
   })
   .then(mapContext => console.info(`Map context id=3 "title" and "description" updated.`, mapContext))
   .catch(error => console.error(error))
```