Block instructions added to an If Instruction should not be moved to end of workflow

Current Situation:

• If a user adds more than two block instructions to an If Instruction then the GUI moves the block instructions to the end of the workflow.

Steps to reproduce:

• Create a workflow w1 and add an If Instruction.
• Add three or more empty block instructions to the If Instruction one after another.
• Add jobs to each block instruction.
• Move to a different workflow then switch back to w1, the instruction in the 3rd or later block instruction will move to the end of the workflow.

Desired Behaviour:

• Block instructions that have been added to an If Instruction should remain in place and should not be moved to the end of the workflow..