catch number format exception for parsing integer and double

Author: wangjoshuah

core-api/src/main/java/com/optimizely/ab/Optimizely.java

@@ -394,7 +394,13 @@ public void track(@Nonnull String eventName,
                 LiveVariable.VariableType.DOUBLE
         );
         if (variableValue != null) {
-            return Double.parseDouble(variableValue);
+            try {
+                return Double.parseDouble(variableValue);
+            }
+            catch (NumberFormatException exception) {
+                logger.error("NumberFormatException while trying to parse \"" + variableValue +
+                "\" as Double. " + exception);
+            }
         }
         return null;
     }
@@ -434,7 +440,13 @@ public void track(@Nonnull String eventName,
                 LiveVariable.VariableType.INTEGER
         );
         if (variableValue != null) {
-            return Integer.parseInt(variableValue);
+            try {
+                return Integer.parseInt(variableValue);
+            }
+            catch (NumberFormatException exception) {
+                logger.error("NumberFormatException while trying to parse \"" + variableValue +
+                "\" as Integer. " + exception.toString());
+            }
         }
         return null;
     }