TASK: Close should check if the current socket is null

[dfeyer]

If we call close (by ex. during a reconnect) but the streamSocket is null, we generate useless error for the user.

[coveralls]

Coverage increased (+0.3%) to 88.525% when pulling 33a7e17 on dfeyer:patch-3 into d1fc1da on repejota:develop.

[coveralls]

Coverage decreased (-1.1%) to 88.442% when pulling b089351 on dfeyer:patch-3 into 82a139b on repejota:develop.

[coveralls]

Coverage decreased (-1.1%) to 88.442% when pulling b089351 on dfeyer:patch-3 into 82a139b on repejota:develop.

[coveralls]

Coverage decreased (-1.1%) to 88.442% when pulling b089351 on dfeyer:patch-3 into 82a139b on repejota:develop.

[coveralls]

Coverage decreased (-1.1%) to 88.442% when pulling b089351 on dfeyer:patch-3 into 82a139b on repejota:develop.

[repejota]

Thanks! 💪