Bug #72740 Fixes NULL byte when using addQueryField()

Fixed regression added in b1b44e0 while working on #72740

Author: scara

src/php5/solr_functions_params.c

@@ -714,7 +714,9 @@ PHP_SOLR_API void solr_arg_list_param_value_fetch(solr_param_t *solr_param, solr
 		solr_string_append_solr_string(&tmp_buffer, &(current_ptr->contents.arg_list.value));
 
 		if (current_ptr->contents.arg_list.delimiter_override) {
-		    solr_string_appendc(&tmp_buffer, *current_ptr->contents.arg_list.delimiter_override);
+		    if (strlen(current_ptr->contents.arg_list.delimiter_override) > 0) {
+		        solr_string_appendc(&tmp_buffer, *current_ptr->contents.arg_list.delimiter_override);
+		    }
 		} else {
 		    solr_string_appendc(&tmp_buffer, separator);
 		}
@@ -731,7 +733,9 @@ PHP_SOLR_API void solr_arg_list_param_value_fetch(solr_param_t *solr_param, solr
 	solr_string_append_solr_string(&tmp_buffer, &(current_ptr->contents.arg_list.value));
 
 	if (current_ptr->contents.arg_list.delimiter_override) {
-	    solr_string_appendc(&tmp_buffer, *current_ptr->contents.arg_list.delimiter_override);
+	    if (strlen(current_ptr->contents.arg_list.delimiter_override) > 0) {
+	        solr_string_appendc(&tmp_buffer, *current_ptr->contents.arg_list.delimiter_override);
+	    }
 	} else {
 	    solr_string_appendc(&tmp_buffer, separator);
 	}

src/php7/solr_functions_params.c

@@ -701,7 +701,9 @@ PHP_SOLR_API void solr_arg_list_param_value_fetch(solr_param_t *solr_param, solr
 		solr_string_append_solr_string(&tmp_buffer, &(current_ptr->contents.arg_list.value));
 
 		if (current_ptr->contents.arg_list.delimiter_override) {
-		    solr_string_appendc(&tmp_buffer, *current_ptr->contents.arg_list.delimiter_override);
+		    if (strlen(current_ptr->contents.arg_list.delimiter_override) > 0) {
+		        solr_string_appendc(&tmp_buffer, *current_ptr->contents.arg_list.delimiter_override);
+		    }
 		} else {
 		    solr_string_appendc(&tmp_buffer, separator);
 		}
@@ -718,7 +720,9 @@ PHP_SOLR_API void solr_arg_list_param_value_fetch(solr_param_t *solr_param, solr
 	solr_string_append_solr_string(&tmp_buffer, &(current_ptr->contents.arg_list.value));
 
 	if (current_ptr->contents.arg_list.delimiter_override) {
-	    solr_string_appendc(&tmp_buffer, *current_ptr->contents.arg_list.delimiter_override);
+	    if (strlen(current_ptr->contents.arg_list.delimiter_override) > 0) {
+	        solr_string_appendc(&tmp_buffer, *current_ptr->contents.arg_list.delimiter_override);
+	    }
 	} else {
 	    solr_string_appendc(&tmp_buffer, separator);
 	}