LunaCON: readarrayfromfile: fail silently if file can't be opened.

git-svn-id: https://svn.eduke32.com/eduke32@3602 1a8010ca-5511-0410-912e-c29ae57300e0

polymer/eduke32/source/lunatic/control.lua

@@ -1225,7 +1225,11 @@ function _cansee(aci, ps)
 end
 
 function _canseespr(s1, s2)
-    return cansee(sprite[s1], sprite[s1].sectnum, sprite[s2], sprite[s2].sectnum) and 1 or 0
+    local spr1, spr2 = sprite[s1], sprite[s2]
+    -- Redundant, but points the error messages to the CON code:
+    check_sector_idx(spr1.sectnum)
+    check_sector_idx(spr2.sectnum)
+    return cansee(spr1, spr1.sectnum, spr2, spr2.sectnum) and 1 or 0
 end
 
 -- TODO: replace ivec3 allocations with stores to a static ivec3, like in
@@ -1742,17 +1746,19 @@ local function gamearray_file_common(qnum, writep)
 
     if (writep) then
         f, errmsg = io.open(fn)
-    else
-        f = kopen4load(fn, 0)
-    end
-
         if (f == nil) then
-        if (not writep) then
-            error(format([[failed opening "%s" for reading: %s]], fn, errmsg), 3)
-        else
             -- file, numints, isnewgar, filename
             return nil, nil, true, fn
         end
+    else
+        f, errmsg = kopen4load(fn, 0)
+        if (f == nil) then
+            if (f==false) then
+                error(format([[failed opening "%s" for reading: %s]], fn, errmsg), 3)
+            else
+                return
+            end
+        end
     end
 
     local fsize = assert(f:seek("end"))
@@ -1813,6 +1819,10 @@ local gamearray_methods = {
     read = function(gar, qnum)
         local f, nelts, isnewgar = gamearray_file_common(qnum, false)
 
+        if (f==nil) then
+            return
+        end
+
         assert(f:seek("set"))
         local ints = f:read_le_int32(nelts)
         if (ints == nil) then

polymer/eduke32/source/lunatic/lunacon.lua

@@ -2132,7 +2132,7 @@ local Cinner = {
     getarraysize = cmd(GARI,W)
         / "%2=%1._size",
     readarrayfromfile = cmd(GARI,D)
-        / "%1:read(%2)",
+        / "%1:read(%2,nil)",  -- false: error on no file, nil: don't.
     writearraytofile = cmd(GARI,D)
         / "%1:write(%2)",