Improve error message given when a property is only exposed as a getter about sinon HOT 3 CLOSED

@ahmed1hsn You are correct in pointing this out! This description is both wrong and it actually made me aware of a bug inside of Sinon. I had a look at the error message that was originally mentioned in #2530 to see what was really going on and found that it does a typeof wrappedMethod, and that will always be undefined as nothing has set that variable yet.

Additionally, as you point out, if something has a getter, it is defined. I must have been a bit sleep deprived when writing this initially. Adding an actual reproduction case (as I could not do that in 2530) is indeed the first step 😄 And the this issue needs updating.

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This issue does not make sense as it is, being based on an issue we could not reproduce and having some faulty assumptions.

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@fatso83 how we can reproduce this issue? and alternatively, how can we find out that property is getter or setter if it's undefined at first place?

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