Remove unneeded validation

Better to allow telemetry to be submitted without a name than to throw
exception here.

Author: trask

core/src/main/java/com/microsoft/applicationinsights/telemetry/RequestTelemetry.java

@@ -144,9 +144,6 @@ public String getName() {
      * @param name A human-readable name
      */
     public void setName(String name) {
-        if (Strings.isNullOrEmpty(name)) {
-            throw new IllegalArgumentException("The event name cannot be null or empty");
-        }
         data.setName(name);
     }