Adjoint/Controlled DumpOperation output prints a state instead of a matrix

[tcNickolas]

Describe the bug
Controlled or adjoint version of DumpOperation prints a state that looks like a DumpMachine output of a state which looks like the Choi–Jamiołkowski state for the given operation.

To Reproduce
Run the following code in a Q# standalone project:

    @EntryPoint()
    operation HelloQ () : Unit {
        Message("Controlled DumpOperation with empty set of controls from a project");
        Controlled DumpOperation(new Qubit[0], (1, ApplyToFirstQubitCA(X, _)));
    }

This will yield

Controlled DumpOperation with empty set of controls from a project
# wave function for qubits with ids (least to most significant): 0;1
∣0❭:     0.000000 +  0.000000 i  ==                          [ 0.000000 ]
∣1❭:     0.707107 +  0.000000 i  ==     ***********          [ 0.500000 ]     --- [  0.00000 rad ]
∣2❭:     0.707107 +  0.000000 i  ==     ***********          [ 0.500000 ]     --- [  0.00000 rad ]
∣3❭:     0.000000 +  0.000000 i  ==                          [ 0.000000 ]

(Adjoint version will produce the same output.)

Expected behavior
I can imagine two reasonable behaviors: print nothing, or print a matrix similar to the non-controlled variant of DumpOperation.

System information

• OS: Windows 10
• Version of affected package: 0.17.2105144881

Additional context
You can see the history of the bug discovery at microsoft/QuantumKatas#629. I isolated it and reproduced it in standalone Q# in addition to a regular Q# Jupyter Notebook cell, so I don't think the issue is in IQ#.