Move / replace operations should fail if origin does not exist

[jkodumal]

According to RFC 6902, a move operation should fail if the from location does not exist. The spec also states that a replace operation should fail if the path does not exist.

My testing shows that neither of these errors are caught at the moment.

[Loushu]

This issue should be reopened, as "replace" operation still doesn't fail if "path" doesn't exist.

[evanphx]

@Loushu Can you give me an example of a document and patch that should work but doesn't?

[Loushu]

@evanphx I'm trying to "replace" a value at a path that doesn't exist. Instead of failing the operation succeeds and "add"s a value at the path. Example:
Document:
{ "Metadata": { } }
Patch:
[
{
"op": "replace",
"path": "/Metadata/key1",
"value": "val1"
}
]
Expected result is a failure to apply patch since key1 doesn't exist
Actual result: {"Metadata":{"key1":"val1"}}