Bubble up SubProcessError to basecommand._main

Author: deveshks

src/pip/_internal/cli/base_command.py

@@ -28,6 +28,7 @@
     CommandError,
     InstallationError,
     PreviousBuildDirError,
+    SubProcessError,
     UninstallationError,
 )
 from pip._internal.utils.deprecation import deprecated
@@ -201,7 +202,8 @@ def _main(self, args):
             logger.debug('Exception information:', exc_info=True)
 
             return PREVIOUS_BUILD_DIR_ERROR
-        except (InstallationError, UninstallationError, BadCommand) as exc:
+        except (InstallationError, UninstallationError, BadCommand,
+                SubProcessError) as exc:
             logger.critical(str(exc))
             logger.debug('Exception information:', exc_info=True)