fix: keep import path values if Bazel-builtin PyInfo is removed #2415
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The collect_imports() function added import strings from BuiltinPyInfo if it was non-None.
However, operator precedence caused the
if-else
ternary to ignore both list comprehensions(one for PyInfo and one for BuiltinPyInfo) if BuiltinPyInfo was None.
To fix, I rewrote the function as a regular for loop to eliminate the ambiguous looking
ternary expression.
Fixes: #2414