fix(conda): avoid panic on an all-operator dependency line

[arpitjain099]

parseDependency normalizes a conda environment.yml dependency string by turning the version operators into spaces, then splits on whitespace and reads parts[0]:

line = strings.NewReplacer(">", " >", "<", " <", "=", " ").Replace(line)
parts := strings.Fields(line)
name := parts[0]

If the dependency value is only operators, e.g. a stray "=", the replaced line is all whitespace and strings.Fields returns an empty slice, so parts[0] panics with an index-out-of-range and aborts the scan.

Repro (environment.yml):

name: crash
dependencies:
  - "="

"=" is a valid YAML string scalar, so it reaches parseDependency. The sibling text parsers (golang/sum, ruby/bundler, rust/cargo) all guard the empty-split case before indexing; conda did not.

The fix returns an empty name/version for such a line, which the caller already drops via its existing if pkg.Name == "" { continue }. go test ./pkg/dependency/parser/conda/... passes.

[DmitriyLewen]

Hello @arpitjain099
Thanks for the fix — it's correct and minimal. One request before merging: please add a regression test for the fixed path.

Right now the panicking input isn't covered by any case, so if the guard is ever accidentally removed or broken, the tests won't catch it and the panic will come back.