Do not try to send signals with no signalManager.
Do not try to send signals with no signalManager.

When widgets are run without canvas, they lack signalManager.

kwikadi/orange3,qusp/orange3,qPCR4vir/orange3,qusp/orange3,qPCR4vir/orange3,kwikadi/orange3,kwikadi/orange3,qPCR4vir/orange3,kwikadi/orange3,cheral/orange3,marinkaz/orange3,qPCR4vir/orange3,marinkaz/orange3,cheral/orange3,qusp/orange3,kwikadi/orange3,qusp/orange3,kwikadi/orange3,marinkaz/orange3,marinkaz/orange3,qPCR4vir/orange3,qPCR4vir/orange3,cheral/orange3,cheral/orange3,marinkaz/orange3,cheral/orange3,marinkaz/orange3,cheral/orange3