Simplify `command.easy_install.expand_paths`

setuptools/command/easy_install.py

@@ -1459,13 +1459,18 @@ def expand_paths(inputs):
 
             # Yield existing non-dupe, non-import directory lines from it
             for line in lines:
-                if not line.startswith("import"):
-                    line = normalize_path(line.rstrip())
-                    if line not in seen:
-                        seen[line] = 1
-                        if not os.path.isdir(line):
-                            continue
-                        yield line, os.listdir(line)
+                if line.startswith("import"):
+                    continue
+
+                line = normalize_path(line.rstrip())
+                if line in seen:
+                    continue
+
+                seen[line] = 1
+                if not os.path.isdir(line):
+                    continue
+
+                yield line, os.listdir(line)
 
 
 def extract_wininst_cfg(dist_filename):