Import project does not work without setting graph name

**Affected functionalities** (all that apply)
* [ ] CSV Mapping
* [ ] Transformation
* [ ] Publishing
* [x] Other

**To Reproduce**
Steps to reproduce the behavior:
1. Create an import project
2. Do not set the `Graph name`
3. Transform
4. See error in pipeline (`Error: Undefined variable 'sourceGraph'`)

**Expected behavior**

It should work, according to the help text
