Missing dependencies array in interpreter.json after upgrade from 0.6.2 to 0.7.0

Problem

We upgraded our Zeppelin instance from 0.6.2 to 0.7.0 today and after that we were not able to add any new dependencies to the interpreters.

The JS console revealed that a.dependencies is undefined. This happens because the interpreter configuration (interpreter.json now has to contain a dependencies array, which was not the case in 0.6.2.

After adding dependencies: [], to interpreter.json it is working just fine.

Solution

If the dependencies array is not present it should either assume that it is empty or fail fast. It should not throw invisible errors in JavaScript.