Change value for an uninitialized local variable to NAN.

ChangeLog.txt

@@ -5,6 +5,7 @@
 - [smart-pattern/valentina#73] Notes for tools.
 - Fix crash while synchronize measurements.
 - Object alias.
+- Change value for an uninitialized local variable to NAN.
 
 # Version 0.7.36 October 24, 2020
 - [#892] Show tooltip for piece node point.

src/libs/vpatterndb/calculator.cpp

@@ -109,7 +109,7 @@ qreal *Calculator::VarFactory(const QString &a_szName, void *a_pUserData)
 
     if (a_szName.startsWith('#'))
     {
-        QSharedPointer<qreal> val(new qreal(0));
+        QSharedPointer<qreal> val(new qreal(std::numeric_limits<qreal>::quiet_NaN()));
         calc->m_varsValues.append(val);
         return val.data();
     }