handling errors when pandoc is missing (#100)

internal/render/pandoc.go

@@ -87,6 +87,8 @@ func dockerPandoc(outputFilename string, errOutputCh chan error) {
 		errOutputCh <- errors.Wrap(err, "output not generated; verify your Docker image is up to date")
 		return
 	}
+
+	errOutputCh <- nil
 }
 
 // 🐼

internal/render/pdf.go

@@ -26,6 +26,12 @@ func pdf(output string, live bool, errCh chan error, wg *sync.WaitGroup) {
 		}
 		for _, policy := range policies {
 			renderToFilesystem(&pdfWG, errOutputCh, data, policy, live)
+			err = <-errOutputCh
+			if err != nil {
+				errCh <- err
+				wg.Done()
+				return
+			}
 		}
 
 		narratives, err := model.ReadNarratives()