Apply documentation changes and improve error handling for inheritance in import command.

Signed-off-by: Leander Stephen D'Souza <leanderdsouza1234@gmail.com>

Author: leander-dsouza

README.md

@@ -248,9 +248,12 @@ Currently there are two ways to specify the path to the repository file passed t
 
    * For instance: `vcs import < my.repos <destination-path>`
 
-    * The extended files are searched relative to the current working directory.
+   * The extended files are searched relative to the current working directory.
 
-    * Therefore, you have to be in the **same** directory as `my.repos` to run the command. In addition, all the extended files must also be relative to the current working directory.
+   * Therefore, you have to be in the **same** directory as `my.repos` to run the command.
+
+     The files being directly extended by the file provided through `stdin` are relative to the current working directory.
+     Any other file being extended is relative to the file extending it.
 
 ### Delete set of repositories
 

vcs2l/commands/import_.py

@@ -154,9 +154,11 @@ def get_repositories(yaml_file, visited_files=None):
                     with open(parent_file, 'r', encoding='utf-8') as parent_f:
                         parent_repos = get_repositories(parent_f, visited_files.copy())
                         combined_repos.update(parent_repos)
+
+                except CircularImportError:
+                    raise
+
                 except Exception as e:
-                    if isinstance(e, CircularImportError):
-                        raise
                     raise RuntimeError(
                         f'Error reading parent file {parent_file}: \n{str(e)}'
                     ) from e