Optimize empty functions

[gshep]

File Location(s)

No response

Proposal

To optimise with empty functions:
If we try to init program, where init export doesn't exist, we can just skip try to load pages and create env instance. We can check if program contains given export by the code on which program depend (or to avoid reading code, paste gear exports in program instance also), for more details see #1085.

Extracted from #1088