Default to 0.0.0 if no Git HEAD is present

Author: JaciBrunning

build.gradle

@@ -35,6 +35,10 @@ def getVersionName = { ->
         }
         return stdout.toString().trim().substring(1)
     } catch (org.gradle.process.internal.ExecException e) {
+        if (!new File(rootDir, '.git/HEAD').exists()) {
+            println("WARN: Could not fetch Git Tag for build version. No Git HEAD available. Substituting version 0.0.0")
+            return "0.0.0"
+        }
         println("WARN: Could not fetch Git Tag for build version. Please install Git and add it to your PATH. For now, the Git commit hash has been substituted.")
         return getGitCommit()
     }
@@ -50,6 +54,10 @@ def getVersionSimple = { ->
         }
         return stdout.toString().trim().substring(1)
     } catch (org.gradle.process.internal.ExecException e) {
+        if (!new File(rootDir, '.git/HEAD').exists()) {
+            println("WARN: Could not fetch Git Tag for build version. No Git HEAD available. Substituting version 0.0.0")
+            return "0.0.0"
+        }
         println("WARN: Could not fetch Git Tag for build version. Please install Git and add it to your PATH. For now, the Git commit hash has been substituted.")
         return getGitCommit()
     }