Make bytes and pushbytes check their immediate better (and similarly)

[jannotti]

byte "hi" "there" did not report an error, but should.
pushbytes was not consistent with bytes in reporting errors, but should be.

[codecov-commenter]

Codecov Report

Merging #3087 (f0e3cce) into master (b9c6032) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3087   +/-   ##
=======================================
  Coverage   43.66%   43.66%           
=======================================
  Files         391      391           
  Lines       86855    86859    +4     
=======================================
+ Hits        37927    37931    +4     
- Misses      42895    42897    +2     
+ Partials     6033     6031    -2     

Impacted Files	Coverage Δ
data/transactions/teal.go	84.00% <ø> (ø)
data/transactions/logic/assembler.go	79.32% <100.00%> (+0.05%)	⬆️
network/wsPeer.go	71.24% <0.00%> (-3.11%)	⬇️
ledger/blockqueue.go	81.03% <0.00%> (-1.15%)	⬇️
data/abi/abi_type.go	90.90% <0.00%> (-0.91%)	⬇️
catchup/service.go	70.12% <0.00%> (ø)
ledger/internal/eval.go	70.21% <0.00%> (+0.26%)	⬆️
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
agreement/proposalManager.go	98.03% <0.00%> (+1.96%)	⬆️
crypto/merkletrie/trie.go	68.61% <0.00%> (+2.18%)	⬆️
... and 2 more

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[jasonpaulos]

Looks good