Dialogic 1.x converter bug : timeline event "if-conditional", unset variable breaks conversion.

[metanoder]

The problem

Describe the bug
When using Dialogic 1.x converter, when using "if-conditional" timeline events, if the conditional is incomplete and unset, this will break the conversion loop, and stops further timeline conversions.

To Reproduce
Steps to reproduce the behavior:

1. load dialogic 1.x into dialogic 2 (with revised converter)
2. Verify files and Begin Conversion.
3. incomplete if-conditional will break conversion loop.
4. error thrown

Screenshots

System (please complete the following information):

• OS: macOSX
• Godot Version: 2.0
• Dialogic Version: 2 alpha 6 (converter modded)

Workaround
Check if-conditionals at point of failure.