Write whole debug cli command to history

Previously the command was being modified in place in order
to find the command name. This was happening before saving
to the history.

Fixes #70

Debug/cli/cli.c

@@ -159,15 +159,12 @@ void CLI_process()
 			}
 			else
 			{
-			// Only do command-related stuff if there was actually a command
+				// Add the command to the history
-			// Avoids clogging command history with blanks
+				CLI_saveHistory( CLILineBuffer );
 
 				// Process the current line buffer
 				CLI_commandLookup();
 
-				// Add the command to the history
-				CLI_saveHistory( CLILineBuffer );
-
 				// Keep the array circular, discarding the older entries
 				if ( CLIHistoryTail < CLIHistoryHead )
 					CLIHistoryHead = ( CLIHistoryHead + 1 ) % CLIMaxHistorySize;
@@ -425,6 +422,11 @@ inline void CLI_saveHistory( char *buff )
 		return;
 	}
 
+        // Don't write empty lines to the history
+        const char *cursor = buff;
+        while (*cursor == ' ') { cursor++; } // advance past the leading whitespace
+        if (*cursor == '\0') { return ; }
+
 	// Copy the line to the history
 	int i;
 	for (i = 0; i < CLILineBufferCurrent; i++)