fix: subsitute fatal error with warning when version stamp missing

This means Zenroom can still run when there was no version stamp found
at build, but it will print out a warning

src/lua/init.lua

@@ -56,8 +56,14 @@ end
 -- ZEN = { assert = assert } -- zencode shim when not loaded
 require('zenroom_common')
 MACHINE = require('statemachine')
+
+-- Stamp the VM with version (set externally at build)
+-- every official Dyne.org release should have this
 SEMVER = require('semver')
+-- returns nil and a warning if no VERSION found
 _G['ZENROOM_VERSION'] = SEMVER(VERSION)
+
+-- Cap the limit of iterations in branches
 _G['MAXITER'] = tonumber(STR_MAXITER)
 
 OCTET = require('zenroom_octet')

src/lua/semver.lua

@@ -189,7 +189,11 @@ function mt:__pow(other)
 end
 
 local function new(major, minor, patch, prerelease, build)
-   assert(major, "At least one parameter is needed")
+   if not major then
+       warn("Zenroom build misses version information")
+       warn("Running VM is not an official release by Dyne.org")
+       return nil
+   end
    local result = { }
    if type(major) == 'string' then
 	  result.original = major