--dry-run gives a false error message

[eepstein]

• I've asked for help in the Truffle Gitter before filing this issue.

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Issue

False error message is shown when using the --dry-run flag. For example:

> truffle migrate --network rat --dry-run
Using network 'rat' (dry run).

tx has a higher gas limit than the block

That last line: tx has a higher gas limit than the block puzzled me for a while.
It turns out to be a spurious error message or warning.

Steps to Reproduce

add the --dry-run option on a migrate call.

Expected Behavior

Tell the user if the call would work. Or, if the call would not work, tell the user why.

Actual Results

It seems that --dry-run gives no gas or changes the gas. Anyway, it seems that an error message related to how --dry-run itself is implemented is what is shown to the user.

It's kind of confusing.

Environment

• Operating System: Mac OS
• Truffle version: 4.0.1
• Ethereum Node: Geth 1.7.2-stable-1db4ecdc
• Ethereum client: ethereumjs-testrpc@6.0.1
• node version: 8.9.0
• npm version: 5.5.1