AST deserialization (to_lua_source) issue with assign's that have no values

[SpiritXmas]

local a;

When parsed and then turned back into source it is left like this

local a =

Temporary fix would be assigning all assigns that have no values a nil node.

[SpiritXmas]

Also another slight issue within the printer is how semi colons are represented. They're each on a new line away from the actual end of line where it should be. Example below

local a = 3
;
local b = 6
;