config: don't throw exception if there's problem with config file rea…

…ding

config.cc

@@ -34,6 +34,7 @@
 
 #include <fstream>
 #include <list>
+#include <sstream>
 #include <string>
 #include <vector>
 
@@ -327,7 +328,14 @@ bool parseFile(nsjconf_t* nsjconf, const char* file) {
 		return false;
 	}
 
-	std::string conf((std::istreambuf_iterator<char>(ifs)), (std::istreambuf_iterator<char>()));
+	std::stringstream buffer;
+	buffer << ifs.rdbuf();
+	std::string conf = buffer.str();
+
+	if (ifs.good()) {
+		PLOG_W("Couldn't read config file '%s'", file);
+		return false;
+	}
 
 	/* Use static so we can get c_str() pointers, and copy them into the nsjconf struct */
 	static nsjail::NsJailConfig json_nsc;