[P163] Check sensor pointer before use

isInitialized() now also requires a valid sensor pointer, so plugin_read()
and plugin_write() never dereference a null sensor. setOutputValues() checks
it as well, and init() deletes a previous sensor object before allocating a
new one, so calling it again does not leak.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/src/PluginStructs/P163_data_struct.cpp

@@ -25,6 +25,8 @@ P163_data_struct::~P163_data_struct() {
 * init
 *****************************************************/
 bool P163_data_struct::init(struct EventStruct *event) {
+  initialized = false;
+  delete sensor; // In case init() is called again
   sensor = new (std::nothrow) CG_RadSens(RS_DEFAULT_I2C_ADDRESS);
 
   if ((nullptr != sensor) && sensor->init()) {
@@ -60,6 +62,8 @@ bool P163_data_struct::plugin_read(struct EventStruct *event) {
 bool P163_data_struct::setOutputValues(struct EventStruct *event) {
   bool result = false;
 
+  if (nullptr == sensor) { return result; }
+
   const uint32_t count    = _readIncrement ? sensor->getNumberOfPulses() : sensor->getNumberOfNewPulses();
   const uint32_t incCount = sensor->getNumberOfPulses();
   const float    iDynamic = sensor->getRadIntensyDynamic();

src/src/PluginStructs/P163_data_struct.h

@@ -39,7 +39,7 @@ public:
   bool plugin_write(struct EventStruct *event,
                     String            & string);
   bool isInitialized() const {
-    return initialized;
+    return initialized && (nullptr != sensor);
   }
 
 private: