Revert "check if suppressed exists before checking for its rate; add test for pass-through of temps without rate"

This reverts commit c66d22694aa0a2df3df01d3ee0056ffa2c040771.
Revert "allow temp basals to pass through without a rate"

This reverts commit 48d07b9b12064b76b697bc48c3e3a998e047a9d4.