Remove redundant defensive check for exception class names

Co-authored-by: trask <[email protected]>

Author: Copilot

agent/agent-tooling/src/main/java/com/microsoft/applicationinsights/agent/internal/classicsdk/TelemetryUtil.java

@@ -61,12 +61,6 @@ private static ExceptionDetailBuilder createWithStackInfo(
     if (Strings.isNullOrEmpty(exceptionMessage)) {
       exceptionMessage = exception.getClass().getName();
     }
-    
-    // Defensive check to ensure the message is never null or empty
-    if (Strings.isNullOrEmpty(exceptionMessage)) {
-      exceptionMessage = "Unknown Exception";
-    }
-    
     exceptionDetails.setMessage(exceptionMessage);
 
     if (parentExceptionDetails != null) {

agent/agent-tooling/src/test/java/com/microsoft/applicationinsights/agent/internal/classicsdk/TelemetryUtilTest.java

@@ -57,17 +57,12 @@ public void testExceptionMessageHandling() {
       String testMessage = testMessages[i];
       String expectedResult = expectedResults[i];
 
-      // Simulate TelemetryUtil logic with defensive check
+      // Simulate TelemetryUtil logic
       String exceptionMessage = testMessage;
       if (Strings.isNullOrEmpty(exceptionMessage)) {
         exceptionMessage = "java.lang.NullPointerException";
       }
 
-      // Defensive check to ensure the message is never null or empty
-      if (Strings.isNullOrEmpty(exceptionMessage)) {
-        exceptionMessage = "Unknown Exception";
-      }
-      
       assertThat(exceptionMessage).isEqualTo(expectedResult);
     }
   }