Using the rzz gate yields an error on circuit drawing

[DrissiReda]

Informations

• Qiskit Terra version:
  qiskit version 0.7.0
• Python version:
  python 3.6.6
• Operating system:
  Red Hat Entreprise Server 7.4

Current behavior

At circuit draw I get the following error

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/site-packages/qiskit/circuit/quantumcircuit.py", line 83, in __str__
    return str(self.draw(output='text'))
  File "/usr/local/lib/python3.6/site-packages/qiskit/tools/visualization/_text.py", line 413, in __str__
    return self.single_string()
  File "/usr/local/lib/python3.6/site-packages/qiskit/tools/visualization/_text.py", line 438, in single_string
    return "\n".join(self.lines())
  File "/usr/local/lib/python3.6/site-packages/qiskit/tools/visualization/_text.py", line 472, in lines
    layers = self.build_layers()
  File "/usr/local/lib/python3.6/site-packages/qiskit/tools/visualization/_text.py", line 758, in build_layers
    elif len(instruction['qubits']) >= 2 and not instruction['cargs']:
KeyError: 'qubits'

Steps to reproduce the problem

from qiskit import * 
q = QuantumRegister(2)
qc = QuantumCircuit(q);
qc.rzz(0, q[0], q[1])
print(qc)

What is the expected behavior?

It should draw the circuit with no problem, but here it gives a KeyError on "qubits"

Suggested solutions

Maybe it is expecting "qargs" instead of "qubits"?