[FIX] web: small fixes in test framework

We fix in this commit three small issues in the test framework.

1. throw an explicit error when we try to do a fieldviewget in the mock
server with a model that does not exist.  This will make it easier to
figure out what went wrong when copy pasting a test from one file into
another, and forgetting to change the model in the createView parameters

2. wrap the result of special methods in the mock server in a deferred,
so we can simply return a value when using that functionality.  Also, it
is more consistent with the rest of the mock server

3. for iframes, we no longer change the src attribute to #test:url.
This had the problem of actually loading the page.  Instead, we change
it into about:blank and we copy the old url into the data-src attribute for
reference.

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