noise: Throw exception on noise allocation failure

src/exceptions.h

@@ -125,6 +125,18 @@ public:
 	Some "old-style" interrupts:
 */
 
+class InvalidNoiseParamsException : public BaseException {
+public:
+	InvalidNoiseParamsException():
+		BaseException("One or more noise parameters were invalid or require "
+			"too much memory")
+	{}
+
+	InvalidNoiseParamsException(const std::string &s):
+		BaseException(s)
+	{}
+};
+
 class InvalidPositionException : public BaseException
 {
 public: