`failure.notes.text` is sometimes not working

[marco-c]

E.g. the result for:

{
    "from":"treeherder",
    "select":["failure.notes.text"],
    "where":{"eq":{"run.taskcluster.id":"bHA7NFiyRialzvmjU6-K3g"}}
}

is:

"failure.notes.text":[null]

even though if you remove the select statement:

       "failure":{
            "auto_classification":"not classified",
            "classification":"fixed by commit",
            "notes":{
                "created":1589317937.542307,
                "failure_classification":"fixed by commit",
                "text":"86b22b1a9f7e"
            }
        },

The same is occurring on other tasks, e.g. TDFEix4zS96Q9QLDHVh4uw, aB9_LFOKTg2mLkuhZbxXkQ.

It doesn't apply in all cases. E.g.:

{
    "from":"treeherder",
    "select":["failure.notes.text"],
    "where":{"eq":{"run.taskcluster.id":"A95EfxKKTYGw0DGRiPLkSA"}}
}

works.

[klahnakoski]

I know the cause. I have a potential solution. still working on this.

[klahnakoski]

Gist of the "missing" pushes

https://gist.github.com/klahnakoski/f3e9353d1068a2485a47a24e084643e5

[klahnakoski]

@marco I am reverting this fix. The fix has produced a number of other problems, and this one is the smallest.