little tool for building Wardley maps

bugfix

scenario: open a file starting with a drawing After this commit the program doesn't crash.

Error: [string "edit.lua"]:127: attempt to get length of field 'data' (a nil value) stack traceback: [love "boot.lua"]:345: in function '__len' [string "edit.lua"]:127: in function 'invalid1' [string "edit.lua"]:116: in function 'check_locs' [string "run.lua"]:35: in function 'initialize' main.lua:96: in function 'initialize' [string "app.lua"]:144: in function 'run_tests_and_initialize' [string "app.lua"]:16: in function <[string "app.lua"]:13> [C]: in function 'xpcall' [love "boot.lua"]:361: in function <[love "boot.lua"]:348> [C]: in function 'xpcall'

Created by  Kartik K. Agaram  on March 26, 2023
AF253GHLDMRDMDL5X3OV2UJ5NPKBBMHGH4B3R5IGR35KO6IKYPKQC
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