Fix long/short issue and fix transform issue

[JerBouma]

Saw this:

(🦋) /fixedincome/ $ treasury --long portugal

Error: local variable 'df_short' referenced before assignment


(🦋) /fixedincome/ $ treasury --long portugal

Error: local variable 'df_short' referenced before assignment


(🦋) /fixedincome/ $ treasury --short australia

Error: local variable 'df_long' referenced before assignment

So fixed it. Also saw this:

(🦋) /economy/ $ macro CPI --transform TPOP

Error: 'CPIUS~TPOP'

Error: not enough values to unpack (expected 2, got 0)

Error: not enough values to unpack (expected 3, got 0)

So fixed it.