Fix crash in einsum

• Fix crash in einsum where a lack of expression for inner reduce causes computing outer expression to crash.

assigned to @rarbore2

enabled an automatic merge when all merge checks for 405cdda7 pass

canceled the automatic merge

added 1 commit

• 0abd27fe - two separate test jobs for parallel execution

Compare with previous version

enabled an automatic merge when all merge checks for 0abd27fe pass

merged

mentioned in commit 02ba90c1