improve changing tie attribute on the views

[gullerya]

In a real life application I've detected 2 issues to be handled:

• even if the attribute value is set to itself the MutationObserver raises event (and thus data-tie change processing runs for nothing) - should be detected and stopped early
• at some cases, still unclear when, the change of data-tie value brings to an error when the previous value was not processed and the old view params property of the view is unset

[gullerya]

released as part of 2.3