fix: Fix has-ref for Nu 0.98

nu/common.nu

@@ -14,12 +14,14 @@ export def 'get-env' [
 }
 
 # Check if a git repo has the specified ref: could be a branch or tag, etc.
-export def 'has-ref' [
+export def has-ref [
   ref: string   # The git ref to check
 ] {
+  let checkRepo = (do -i { git rev-parse --is-inside-work-tree } | complete)
+  if not ($checkRepo.stdout =~ 'true') { return false }
   # Brackets were required here, or error will occur
-  let parse = (do -i { (git rev-parse --verify -q $ref) })
-  if ($parse | is-empty) { false } else { true }
+  let parse = (do -i { git rev-parse --verify -q $ref } | complete)
+  if ($parse.stdout | is-empty) { false } else { true }
 }
 
 # Check if some command available in current shell