Db get failed for ""

[willyw0nka]

Describe the bug
Running popeye shows the error Boom! Db get failed for "": invalid table '' (see logs)

To Reproduce
Steps to reproduce the behavior:

$ popeye -n app
 ___     ___ _____   _____                       D          .-'-.     
| _ \___| _ \ __\ \ / / __|                       O     __| K    `\  
|  _/ _ \  _/ _| \ V /| _|                         H   `-,-`--._   `\
|_| \___/_| |___| |_| |___|                       []  .->'  X     `|-'
  Biffs`em and Buffs`em!                            `=/ (__/_       /  
                                                      \_,    `    _)  
                                                         `----;  |     


Boom! Db get failed for "": invalid table '' (see logs)

Expected behavior
Popeye output is expected

Versions (please complete the following information):

• OS: Ubuntu 22.04.2
• Popeye 0.20.2
• K8s v1.25.13+rke2r1

Additional context
Logs written to /tmp/popeye.log

12:03PM DBG Connecting to API Server https://[REDACTED]
12:03PM DBG No label selector found in context. Listing all resources
12:03PM ERR Db get failed for "": invalid table ''
12:03PM ERR goroutine 99 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:24 +0x5e
github.com/derailed/popeye/pkg.BailOut({0x224c640, 0xc0009acd00})
	github.com/derailed/popeye/pkg/helpers.go:22 +0x10f
github.com/derailed/popeye/pkg.(*Popeye).runLinter.func1()
	github.com/derailed/popeye/pkg/popeye.go:274 +0x7e
panic({0x1bda7c0?, 0xc0009acd00?})
	runtime/panic.go:770 +0x132
github.com/derailed/popeye/internal/db.(*DB).MustITFor(0x0?, {{0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0}, {0x0, 0x0}, {0x0, ...}, ...})
	github.com/derailed/popeye/internal/db/db.go:58 +0x138
github.com/derailed/popeye/internal/lint.(*Gateway).checkRefs(0xc00098db78, {0x22689d8, 0xc0009eac30}, 0xc000746820)
	github.com/derailed/popeye/internal/lint/gw.go:52 +0x129
github.com/derailed/popeye/internal/lint.(*Gateway).Lint(0xc00098db78, {0x22689d8, 0xc000738a80})
	github.com/derailed/popeye/internal/lint/gw.go:43 +0x233
github.com/derailed/popeye/internal/scrub.(*Gateway).Lint(0xc0005ee220, {0x22689d8, 0xc000738a80})
	github.com/derailed/popeye/internal/scrub/gw.go:45 +0x288
github.com/derailed/popeye/pkg.(*Popeye).runLinter(0xc0000b9440, {0x22689d8?, 0xc000738a80?}, {{0xc0004c9dd0, 0x24}, {0xc000481f00, 0x13}, {0xc000481f14, 0x7}, {0xc0005e0ab8, ...}, ...}, ...)
	github.com/derailed/popeye/pkg/popeye.go:278 +0x79
created by github.com/derailed/popeye/pkg.(*Popeye).lint in goroutine 1
	github.com/derailed/popeye/pkg/popeye.go:249 +0x905

[derailed]

@willyw0nka Thanks for the heads up Albert! Hopefully we're happier in v0.20.3...