fix: create cache directory with offline import (#5436)

Allow the user to import his own cve.db file through --import cve.db by
creating cachedir if it does not exist

Signed-off-by: Fabrice Fontaine <fabrice.fontaine@orange.com>

Author: ffontaine

cve_bin_tool/cvedb.py

@@ -798,6 +798,8 @@ def copy_db(self, filename, export=True):
         if export:
             shutil.copy2(self.dbpath, filename)
         else:
+            if not self.cachedir.is_dir():
+                self.cachedir.mkdir(parents=True)
             shutil.copy2(filename, self.dbpath)
 
     def remove_cache_backup(self) -> None: