Fix crash when buffer doesn't accept fluids

fluid_lib/buffer.lua

@@ -47,6 +47,10 @@ function fluid_lib.buffer_accepts_fluid(pos, buffer, fluid)
 	local bfdata = fluid_lib.get_buffer_data(pos, buffer)
 	if not bfdata then return false end
 
+	if not bfdata.accepts then
+		return false
+	end
+
 	if bfdata.fluid ~= "" and bfdata.fluid ~= fluid then
 		return false
 	end

fluid_lib/init.lua

@@ -32,6 +32,7 @@ function fluid_lib.cleanse_node_description(node)
 	local ndef = minetest.registered_nodes[node]
 	if not ndef then return nil end
 
+	-- Remove translation string
 	local desc_no_translation = ndef.description
 	if string.match(desc_no_translation, "^\27") ~= nil then
 		desc_no_translation = desc_no_translation:match("[)]([%w%s]+)\27")

fluid_transfer/network.lua

@@ -212,7 +212,7 @@ function fluid_lib.transfer_timer_tick(pos, elapsed)
 								local fluidcount = srcdef.node_io_get_liquid_stack(srcpos, srcnode, "", aindex):get_count()
 								local defc = math.min(fluidcount, idef)
 								local defi = srcdef.node_io_take_liquid(srcpos, srcnode, "", nil, afluid, defc)
-								if defi.millibuckets > 0 then
+								if defi and defi.millibuckets > 0 then
 									local lo = destdef.node_io_put_liquid(pos, destnode, "", nil, afluid, defi.millibuckets)
 									pumped = pumped + (defi.millibuckets - lo)
 									changed = true