Check if TDSCommand counter is null before incrementing. (#2368)

* Null check for getCounter

* Review fixes

* Added trailing comma to reduce code diff

src/main/java/com/microsoft/sqlserver/jdbc/IOBuffer.java

@@ -6943,6 +6943,15 @@ final boolean readPacket() throws SQLServerException {
 
             // if messageType is RPC or QUERY, then increment Counter's state
             if (tdsChannel.getWriter().checkIfTdsMessageTypeIsBatchOrRPC() && null != command) {
+                if (logger.isLoggable(Level.FINER)) {
+                    logger.warning(toString() + ": increasing state of counter for TDS Command: " + command.toString());
+                }
+
+                if (null == command.getCounter()) {
+                    MessageFormat form = new MessageFormat(SQLServerException.getErrString("R_NullValue"));
+                    Object[] msgArgs1 = {"TDS command counter"};
+                    throw new SQLServerException(form.format(msgArgs1), null);
+                }
                 command.getCounter().increaseCounter(packetLength);
             }
 

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerResource.java

@@ -535,7 +535,7 @@ protected Object[][] getContents() {
         {"R_crCommandCannotTimeOut", "Request failed to time out and SQLServerConnection does not exist"},
         {"R_InvalidIPAddressPreference", "IP address preference {0} is not valid."},
         {"R_UnableLoadAuthDll", "Unable to load authentication DLL {0}"},
-        {"R_illegalArgumentTrustManager", "Interal error. Peer certificate chain or key exchange algorithem can not be null or empty."},
+        {"R_illegalArgumentTrustManager", "Internal error. Peer certificate chain or key exchange algorithm can not be null or empty."},
         {"R_serverCertExpired", "Server Certificate has expired: {0}: {1}"},
         {"R_serverCertNotYetValid", "Server Certificate is not yet valid: {0}: {1}"},
         {"R_serverCertError", "Error validating Server Certificate: {0}: \n{1}:\n{2}."},