More robust vendor profile parsing.

src/slic3r/GUI/AppConfig.hpp

@@ -5,6 +5,8 @@
 #include <map>
 #include <string>
 
+#include <boost/algorithm/string/trim_all.hpp>
+
 #include "libslic3r/Config.hpp"
 #include "libslic3r/Semver.hpp"
 
@@ -52,7 +54,13 @@ public:
 	std::string 		get(const std::string &key) const
 		{ std::string value; this->get("", key, value); return value; }
 	void			    set(const std::string &section, const std::string &key, const std::string &value)
-	{ 
+	{
+#ifndef _NDEBUG
+		std::string key_trimmed = key;
+		boost::trim_all(key_trimmed);
+		assert(key_trimmed == key);
+		assert(! key_trimmed.empty());
+#endif _NDEBUG
 		std::string &old = m_storage[section][key];
 		if (old != value) {
 			old = value;