From 03d69c7662f95def1feb5983f0fbd212755c3705 Mon Sep 17 00:00:00 2001
From: Marcel Voigt <mv@noch.so>
Date: Tue, 26 Jan 2016 23:04:10 +0100
Subject: [PATCH] Fix input validation by using only known config values

---
 src/PHPSemVerChecker/Console/InputMerger.php | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/PHPSemVerChecker/Console/InputMerger.php b/src/PHPSemVerChecker/Console/InputMerger.php
index b7fb249..8a0f6a8 100644
--- a/src/PHPSemVerChecker/Console/InputMerger.php
+++ b/src/PHPSemVerChecker/Console/InputMerger.php
@@ -23,7 +23,10 @@ public function merge(InputInterface $input, Configuration $config)
 			if ($input->hasArgumentSet($argument)) {
 				$config->set($argument, $value);
 			} else {
-				$input->setArgument($argument, $config->get($argument));
+				$configValue = $config->get($argument);
+				if ($configValue !== null) {
+					$input->setArgument($argument, $config->get($argument));
+				}
 			}
 		}
 
@@ -31,7 +34,10 @@ public function merge(InputInterface $input, Configuration $config)
 			if ($input->hasOptionSet($option)) {
 				$config->set($option, $value);
 			} else {
-				$input->setOption($option, $config->get($option));
+				$configValue = $config->get($option);
+				if ($configValue !== null) {
+					$input->setOption($option, $configValue);
+				}
 			}
 		}
 	}