Was being caught by the try block but still logging an error to the
console unnecessarily: we should not expect there to necessarily
be a matrix client since we run this from the constructor and
there's a shared instance which could be constructed at any point.
We already intercepted most of the cases where no integration manager was present, though there was a bug in many components where openAll() would be called regardless of an integration manager being available.
The integration manager being disabled by the user is handled in the IntegrationManager classes rather than on click because we have quite a few calls to these functions. The StickerPicker is an exception because it does slightly different behaviour.
This also removes the old "no integration manager configured" state from the IntegrationManager component as it is now replaced by a dialog.
This avoids a visual glitch where the Integration Manager portal would briefly
appear, but then be replaced by a smaller Terms dialog when there's something to
agree to.
To resolve this minimal code churn, this cheats a bit and customises the size of
the terms dialog to match the IM portal modal when terms are shown for IM
purposes.
Fixes https://github.com/vector-im/riot-web/issues/10386
David Baker