Enrich BQSQLExceptions with a little more information for ALL exceptions

Should give more information related to #100

src/main/java/net/starschema/clouddb/jdbc/BQSQLException.java

@@ -230,6 +230,8 @@ private static String enrichReason(String reason, Throwable cause) {
             if (googleJsonResponseException.getDetails() != null) {
                 return prefix + googleJsonResponseException.getDetails().getMessage();
             }
+        } else {
+            return prefix + cause.toString();
         }
         return reason;
     }

src/test/java/net/starschema/clouddb/jdbc/BQSQLExceptionTest.java

@@ -0,0 +1,46 @@
+package net.starschema.clouddb.jdbc;
+
+import com.google.api.client.googleapis.json.GoogleJsonError;
+import com.google.api.client.googleapis.json.GoogleJsonResponseException;
+import com.google.api.client.http.HttpHeaders;
+import com.google.api.client.http.HttpResponseException;
+import java.io.IOException;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class BQSQLExceptionTest {
+
+    @Test
+    public void exceptionCauseEnrichmentIOExceptionTest() {
+        IOException ioException = new IOException("Read timed out!");
+        BQSQLException exception = new BQSQLException("Oops! Something went wrong:", ioException);
+
+        String actualMessage = exception.getMessage();
+        Assert.assertEquals("Oops! Something went wrong: - java.io.IOException: Read timed out!", actualMessage);
+    }
+
+    @Test
+    public void exceptionCauseEnrichmentGoogleJsonResponseExceptionTest() {
+        HttpHeaders headers = new HttpHeaders();
+        HttpResponseException.Builder builder = new HttpResponseException.Builder(
+            403,"you can't see this", headers
+        );
+        GoogleJsonError error = new GoogleJsonError();
+        error.setMessage("You don't have access");
+        GoogleJsonResponseException cause = new GoogleJsonResponseException(builder, error);
+        BQSQLException exception = new BQSQLException("Oops! Something went wrong:", cause);
+
+        String actualMessage = exception.getMessage();
+        Assert.assertEquals("Oops! Something went wrong: - You don't have access", actualMessage);
+    }
+
+    @Test
+    public void exceptionCauseEnrichmentOtherRuntimeExceptionTest() {
+        Exception exception = new RuntimeException("something went horribly wrong");
+        BQSQLException sqlException = new BQSQLException("Oops! Something went wrong:", exception);
+
+        String actualMessage = sqlException.getMessage();
+        Assert.assertEquals("Oops! Something went wrong: - RuntimeException: something went horribly wrong", actualMessage);
+    }
+
+}