check poetry

Author: kevinjqliu

Makefile

@@ -23,7 +23,7 @@ help:  ## Display this help
 	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m\033[0m\n"} /^[a-zA-Z_-]+:.*?##/ { printf "  \033[36m%-20s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)
 
 install-poetry:  ## Install poetry if the user has not done that yet.
-	@if ! $(POETRY) --version &> /dev/null; then \
+	@if ! command -v poetry &> /dev/null; then \
          echo "Poetry could not be found. Installing..."; \
          ${PIP} install poetry==1.8.3; \
      else \