improve errors when openal fails to initialize #1240

❌ Love Testsuite MacOS

359 tests were completed in 18.485s with 333 passed, 12 failed, and 14 skipped

Renderer: OpenGL | 4.1 APPLE-21.0.19 | Apple Inc. | Apple Software Renderer

Module	Pass	Fail	Skip	Time
audio	19	11	1	0.622s
data	12	0	0	0.216s
event	4	0	2	0.103s
filesystem	33	0	2	0.628s
font	7	0	0	0.115s
graphics	105	1	2	4.028s
image	5	0	0	0.080s
joystick	6	0	0	0.125s
keyboard	10	0	0	0.165s
love	6	0	0	0.101s
math	20	0	0	0.337s
mouse	18	0	0	0.373s
physics	26	0	0	0.433s
sensor	1	0	3	0.064s
sound	4	0	0	0.098s
system	7	0	2	0.178s
thread	5	0	0	0.538s
timer	6	0	0	0.567s
touch	3	0	0	0.044s
video	2	0	0	0.051s
window	34	0	2	9.618s

🔴 Source
code tests/audio.lua:169: attempt to index local 'filter' (a nil value)nil

🔴 getActiveEffects
assert 2 [check 1 effect running] expected '1' got '0'

🔴 getActiveSourceCount
assert 3 [check now active] expected '1' got '0'

🔴 getDistanceModel
assert 2 [check default value] expected 'inverseclamped' got 'none'

🔴 getDopplerScale
assert 2 [check setting to 0] expected '0' got '1'

🔴 getEffect
code tests/audio.lua:268: attempt to index a nil valuenil

🔴 pause
assert 2 [check 1 paused] expected '1' got '0'

🔴 play
assert 1 [check something playing] expected 'true' got 'false'

🔴 setDopplerScale
assert 1 [check set to 0] expected '0' got '1'

🔴 setEffect
code tests/audio.lua:434: attempt to index local 'settings' (a nil value)nil

🔴 stop
assert 1 [check is playing] expected 'true' got 'false'

🔴 Video
assert 22 [check video seeking] expected '0.2' got '0'