Fix .msg parsing CLI exception when msgconvert is not found in the system path

CHANGELOG.md

@@ -7,6 +7,8 @@ Collector (HEC)
 GeoIP DB to avoid being blocked by security proxies
 - Reduce default DNS timeout to 2.0 seconds
 - Add alignment booleans to JSON output
+- Fix `.msg` parsing CLI exception when `msgconvert` is not found in the 
+system path
 
 3.9.7
 -----

parsedmarc/__init__.py

@@ -958,10 +958,7 @@ def parse_report_email(input_, nameservers=None, timeout=2.0):
             with open(eml_path, "rb") as eml_file:
                 rfc822 = eml_file.read()
         except FileNotFoundError:
-            raise FileNotFoundError(
-                "msgconvert not found. Please ensure it is installed\n"
-                "sudo apt install libemail-outlook-message-perl\n"
-                "https://github.com/mvz/email-outlook-message-perl")
+            raise ParserError("msgconvert utility not found")
         finally:
             os.chdir(orig_dir)
             shutil.rmtree(tmp_dir)