git not required to build

build.gradle

@@ -24,6 +24,7 @@ def buildNumber = ""
 def semver = ""
 def date = ""
 ext {
+    try {
         git = org.ajoberstar.grgit.Grgit.open(file(".git"))
         date = git.head().date.format("yy.MM.dd")
         revision = "-${git.head().abbreviatedId}"
@@ -43,7 +44,9 @@ ext {
                     case "change":
                     case "changed":
                     case "changes":
-                    if (major == 0) {minorCount = 1; patchCount = 0;}
+                        if (major == 0) {
+                            minorCount = 1; patchCount = 0;
+                        }
                         break;
                     case "refactor":
                     case "remove":
@@ -60,6 +63,9 @@ ext {
         }
         buildNumber = "-${index}"
         semver = "-${major}.${minor}.${patch}"
+    } catch (Throwable ignore) {
+        revision = "unknown";
+    }
 }
 
 version = date + revision + buildNumber + semver